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eBike Multi-Point Inspection
Dealer-Style Technician Checklist · Electric Sports Company
🔧 Work Order / Bike Information
🧰 Tools Required for This Workflow
⚠️ The E-bike Tester cannot replace the multimeter for wiring tests. Both tools are needed for a complete triage.
STEP 1 — Select vehicle type:
STEP 2 — Select the presenting symptom:
Ebike Has No Power
The bike is completely unresponsive — no display, no lights, nothing turns on
Ebike Has Power but Not Functioning
Display or lights come on, but motor doesn't run or there's another functional issue
🔴 No Power — Focus on: Section 1 (Charger & Battery) → 2 (Power Protection) → 3 (Power Switch) → 4 (Wire Harness). Work through these in order before moving to Controller or Motor.
🟡 Has Power but Not Functioning — Focus on: Start with Section 1 (record voltage), then Section 5 (Controller), Section 6 (Motor), Section 7 (Controls — brake cutoff is a common culprit), Section 4 (Wire Harness).
STEP 3 — Work through the inspection checklist:
RATING KEY:
GREEN — Good, no action needed
YELLOW — Service soon
RED — Needs immediate attention
⚠️
Deck Seal Reminder — Before You Start
When replacing or removing the deck on this scooter, ensure all weather seals and gaskets are replaced and the deck cover sits back down fully seated and sealed. Moisture ingress through an improperly resealed deck is a leading cause of light box failure, connector corrosion, and controller damage on re-repairs.
1. Charger & Battery
—
Voltage at charger port
Measure DC voltage at the eBike charging port. Should match rated battery voltage.
Measure DC voltage at the scooter charging port. Should match rated battery voltage.
Multimeter
Step 1 — Test the charger first (if available)
Before measuring the battery through the port, test the charger output on its own. A bad charger can look like a bad battery.
- Plug the charger into the wall — do not connect it to the bike yet
- Set multimeter to DC Volts, range above expected output (50V+ for 48V systems, 40V+ for 36V)
- Place black probe on the charger output plug outer ring / sleeve (negative)
- Place red probe on the center charging pin (positive)
- A healthy charger reads slightly above rated voltage (not-connected, no load): 42–43V for 36V system · 54–54.6V for 48V · 58.8V for 52V
✓ Charger reads above rated voltage = charger is outputting correctly
⚠ Charger reads 0V or battery voltage only = charger is faulty — test battery separately before condemning it
Step 2 — Measure voltage at the charging port on the eBikescooter
With charger disconnected, measure the battery voltage through the charging port.
- Set multimeter to DC Volts
- Place black probe on the outer ring / sleeve of the charging port (negative)
- Place red probe on the center charging pin (positive)
- Record reading — this is your battery voltage through the port
✓ 36V system: 36–42V · 48V system: 48–54.6V · 52V system: 52–58.8V
⚠ Low reading here could be a weak battery OR connector resistance — confirm with a direct battery terminal test (next row)
Battery voltage (direct)
Test the battery directly at its terminals — bypasses charging port and connector resistance for the truest reading.
Test the scooter battery directly at the XT connector or pack terminals — bypasses the charging port for the truest reading.
Multimeter
eBike — Method 1: Exposed Slide Rail Terminals (most accurate)
Most common on Lectric, Rad, Aventon and similar downtube/rear-rack slide batteries.
- Slide the battery partially back on the frame rail — just far enough to expose the metal contact strips, without fully removing it
- Identify the positive (+) and negative (–) rails — usually labeled or color-coded on the battery housing
- Set multimeter to DC Volts, range above rated voltage
- Touch red probe to +, black probe to – directly on the contact rails
- Record reading
✓ Bypasses all connector resistance — use this to confirm whether a low charging-port reading is a battery issue or a connector issue
⚠ More than 0.5V lower than rated voltage = battery is weak or discharged · More than 0.5V difference vs charging port reading = connector resistance, check slide pins
eBike — Method 2: 2-Pin XLR Battery Terminals
For batteries with a separate discharge connector (not the charge port).
- Locate the round 2-pin XLR discharge connector on the battery
- Black probe on the outer barrel/shell (negative)
- Red probe on the center pin (positive)
- Record voltage
📌 If you get a negative reading, swap probes — polarity is reversed on some brands.
eBike — Method 3: GX16 Aviation Connector
- GX16 connectors have multiple pins — no universal polarity standard
- Set multimeter to DC Volts · Probe pin pairs one at a time
- The pair that reads closest to rated voltage = B+ and B–
- Check the bike's wiring diagram to confirm pin assignments before probing blindly
⚠ Some GX16 connectors carry signal wires alongside power — identify B+ and B– from wiring diagram first.
Scooter — Method 1: XT60 / XT30 Battery Connector (most common)
XT60 = large yellow connector · XT30 = smaller orange version. Found on most Apollo, Segway, Kaabo, and similar scooters.
- Locate the XT60/XT30 battery output connector — usually inside the deck or accessible through a panel
- The housing is molded with + and – markings on each blade terminal
- Set multimeter to DC Volts, range above rated voltage
- Touch red probe to +, black probe to –
- Record reading
✓ 36V scooter: expect 36–42V · 48V scooter: expect 48–54.6V · 52V scooter: expect 52–58.8V
⚠ Reading below 30V on a 36V system = battery deeply discharged or faulty · 0V = check fuse between battery and connector
Scooter — Method 2: Exposed Battery Pack Terminals
Use when the XT connector is not accessible or you need to confirm the pack voltage before the output connector.
- Open the deck panel to access the battery pack
- Locate the battery pack's B+ and B– leads — usually red and black wires coming off the BMS board
- Touch red probe to B+, black probe to B–
- Record reading
✓ If pack terminals read correct voltage but XT connector reads 0V = BMS is cutting output or fuse is blown between pack and connector
⚠ Do not probe bare BMS board terminals unless you are certain of the pin layout — short circuiting B+ to any signal wire can destroy the BMS instantly.
Battery connector — slide, fold-access & integrated
Inspect the battery connection point for pushed-back pins, arcing damage, corrosion, or poor seating. Method depends on battery type.
Visual Multimeter
⚠ Watch for — Pushed-Back Pin in Battery Slide Connector: A pin pushed down when the battery slides on creates an air gap. At full charge, voltage arcs across the gap and the bike runs normally. As the battery depletes, voltage drops and can no longer bridge the gap — causing a sudden, clean cutoff that looks like a dead battery. Check: slide battery off and inspect every pin in the slide connector. Any pin sitting lower than the others is the culprit. Also look for pitting or burn marks from arcing on the battery contacts.
⚠ The most common symptom of a bad battery connector is a bike that runs fine on a full charge but cuts off suddenly and cleanly as the battery depletes. At full voltage, arcing bridges a pushed-back pin. As voltage drops, it can't — causing a clean cutoff misdiagnosed as a dead battery.
Type 1 — Rail Slide Connector (Rad, Aventon Aventure, etc.)
Battery slides on/off a rail on the frame. Pins on the battery mate to pins on the frame rail.
- Slide battery fully off the bike
- Look straight down the length of the connector rail on both the battery and the frame — every pin should sit at the same height, flush with the housing
- Any pin sitting lower than its neighbors = pushed-back pin — this is the fault
- Look for pitting, burn marks, or discoloration on the contacts — signs of arcing
- Slide battery back on and off — should engage and disengage smoothly with no wobble or loose fit
✓ All pins flush and equal height · No pitting or burn marks · Smooth engagement
Type 2 — Fold-to-Access Connector (Lectric XP4, XP4 Step-Thru)
The XP4 battery does not slide — it locks into the frame and connects via a multi-pin connector accessed by folding the bike at the hinge. The connector is inside the frame at the fold point.
- Fold the bike at the stem hinge to expose the battery connector port
- Disconnect the battery connector — it is typically a large multi-pin XT-style or proprietary connector at the fold joint
- Inspect every pin in both the male and female halves — look for bent, recessed, or corroded pins
- Check the connector housing for cracks or debris that could prevent full seating
- Reconnect firmly — you should feel/hear a positive click or latch engagement
- Check that the rocker switch on the battery is in the ON (I) position after reconnecting
📌 XP4 tip: A partially seated connector here is one of the most common "no power" causes on this model. Always confirm the connector is fully locked before diagnosing further.
Type 3 — Integrated Pop-Out Battery (Aventon Pace 500, Level, Sinch, etc.)
The battery is built into the downtube or frame body and pops out via a key lock. The electrical connection is made by spring-loaded pins or a recessed multi-pin connector inside the battery cavity.
- Power off the bike · Use the key to unlock and pop the battery out of the frame
- Inspect the contact pins inside the frame cavity — these are often spring-loaded pogo pins or a recessed connector block
- Look for bent or stuck pins that aren't springing back fully, corrosion on the contact faces, or debris packed into the cavity
- Inspect the matching contacts on the battery itself for the same damage
- Reseat the battery — it should lock flush with no gap between battery and frame
- A gap or partial insertion means the contacts aren't fully mating — clean cavity and retry
✓ All pogo pins spring freely · Contact faces clean and bright · Battery seats flush and locks securely
⚠ Stuck or corroded pogo pins are common on bikes stored outside — a pin stuck in the depressed position makes no contact even when the battery looks fully seated
Voltage Drop Test — applies to all types
- With battery connected and bike powered on, set multimeter to DC voltage
- Measure voltage directly at battery terminals — record
- Measure voltage at the controller B+ and B– input — record
- More than 0.5V difference = resistance in the connector or wiring
✓ Voltage drop <0.5V battery to controller = connector is good
2. Power Protection
—
Fuse / breaker & breaker wires (if equipped)
Inspect fuse visually and test continuity. Check breaker wires for damage.
Multimeter
- Disconnect power. Visually inspect fuse for burnt element.
- Set multimeter to continuity mode. Touch probes across fuse ends — beep = good.
- Check breaker wires for continuity end-to-end.
Kill switch (if equipped)
Confirm switch is in ON position. Check for corrosion at contacts.
3. Power Switch / Ignition
—
Power switch function
Press/activate the power switch — does the display respond?
Example — Lectric XP4 (two-step power): First flip the battery rocker switch to ON (I). Then press and hold the left handlebar button pad until the display lights up. A common fault is the battery rocker being left in the OFF position — check this before anything else.
On/Off Button:
- Confirm battery rocker switch is ON (I) if equipped (e.g. Lectric XP4)
- Press and hold handlebar/display power button — display should light up
- If no response, unplug button connector and test pins in continuity mode — should change state when pressed
- Insert key and turn to ON position — display should respond
- Test continuity across switch pins: ON = beep, OFF = no beep
- Check barrel for corrosion — moisture kills these
Some scooters have a key that must be turned to ON and a separate button that must be pressed or held to complete the circuit. Both must be engaged — turning the key alone won't power the scooter on.
- Insert key and turn to ON position
- Locate the secondary button (usually on the handlebar or key housing) and press or hold it
- If the scooter still won't power on, test the button separately in continuity mode — unplug the button connector and check that pressing the button changes the circuit state (beep to no beep or vice versa)
- Also test the key switch independently — continuity in ON position, no continuity in OFF
⚠ Easy to miss on unfamiliar scooters — if a key switch bike won't power on, always check whether there is a second button required before diagnosing deeper
Display / power button signal wire to controller
The wire from the handlebar display or button unit to the controller carries the power-on signal. A break here means pressing the button does nothing — even with a full battery. On key-switch bikes this is the ignition wire.
On an XP4: The signal wire runs from the handlebar button pad connector down to the controller. When you press and hold the power button, this wire tells the controller to wake up. If it's broken or has a pushed-back pin at either end, the button press never reaches the controller. This is separate from the battery rocker switch — the rocker cuts all power at the battery, while this wire only carries the on/off signal.
Multimeter
- Disconnect battery
- Set multimeter to continuity mode
- Unplug the display/button connector at the controller end
- Test the signal wire end-to-end from the button connector pin to the controller input pin
- Beep = intact · No beep = broken wire or bad connector pin
✓ Pass: Continuity beep end-to-end on signal wire
On Gemini controllers: signal wire is No. 3 (red) or No. 24 (orange)
4. Wire Harness
—
Visual inspection — full harness
Trace entire harness. Look for chafing, pinched wires, melted insulation, cuts, rodent damage.
Connector inspection — all connectors
Visual check for bent/pushed-back pins, corrosion, cracked housings, and incomplete seating. Confirm continuity through each pin with multimeter.
Visual Multimeter
Step 1 — Visual inspection (do first):
- Unplug each connector and inspect both male and female halves — look for bent, pushed-back, or corroded pins
- Check housings for cracks, debris, or moisture damage
- Reseat all connectors firmly — a connector that looks plugged in but isn't fully seated is a common intermittent fault
- On waterproof connectors, confirm the rubber seal is seated and the locking collar is engaged
A pin can look perfectly straight but have poor internal contact from corrosion or a micro-crack in the crimp. This test confirms each pin is actually passing current end-to-end through the connector.
- Disconnect battery. Set multimeter to continuity mode (beep)
- Leave the connector plugged in — you are testing through the mated connector, not across open pins
- Touch one probe to the wire on the feed side of a pin (before the connector) and the other probe to the wire on the load side (after the connector)
- Beep = good contact through that pin · No beep = open circuit at that pin — the connector is the fault even if it looks fine visually
- Work through every pin in the connector one at a time and record any that fail
💡 Tip — backprobing: On sealed or hard-to-reach connectors, use a thin probe or a straightened paperclip inserted alongside the wire into the back of the connector housing to make contact without unplugging it. This lets you test live or under-load without breaking the circuit.
✓ Every pin beeps end-to-end through the mated connector
⚠ No beep on a pin that looks fine = internal crimp failure or corroded contact face — replace that connector or re-pin that terminal · Also check: wiggle the connector while probing — an intermittent beep means the pin is making marginal contact that will fail under vibration
Step 3 — Short circuit check (same setup)
- With battery still disconnected, test between the positive and negative pins on each connector segment
- Any beep between + and – = short circuit in that section — do not reconnect power until found
⚠ A shorted connector can destroy a controller in seconds when power is applied — always do this check before reconnecting the battery after any harness work.
Wiggle test
With bike powered on, flex and wiggle harness sections — any flicker or cutout indicates an internal wire break at that location.
Continuity — battery plug to controller
Test that the power wire is intact from the battery connector (now unplugged) to the controller input. The battery can be in another room — you are only testing the wire.
Multimeter only — E-bike Tester cannot do this check
Setup: Unplug the battery and set it aside (even another room is fine). The controller stays mounted in the bike. You are testing the wire that connects them — nothing else.
- Set multimeter to continuity mode
- Find the harness-side battery plug — the connector that was just unplugged from the battery, still attached to the wire running into the bike
- Touch red probe to the positive pin inside that plug, black probe to the positive input pin at the controller
- Beep = wire is good · No beep = broken wire or bad connector pin
- Repeat for the negative/ground wire
✓ Pass: Both positive and negative wires beep end-to-end
5. Controller
—
MOSFET continuity check
Discharge controller first (see step above). Diode reading one direction only = pass. Both directions = shorted MOSFET, replace controller.
Multimeter only
- Discharge controller fully (power button bleed + 30 s wait — see step above)
- Disconnect controller from bike. Set multimeter to Diode mode
- Test – probe (Black) to Green phase wire → note reading
- Test – probe (Black) to Yellow phase wire → note reading
- Test – probe (Black) to Blue phase wire → note reading
- Repeat with + probe (Red) to Green, Yellow, Blue phase wires
✓ Pass: Diode reading in one direction only (typically 0.4–0.7V forward drop)
⚠ Fail: Reading in both directions or 0.000 (dead short) = shorted MOSFET → replace controller
💡 Light Box check (scooter / skateboard)
The light box is a secondary controller that manages LED lighting effects. A failed light box can cause power issues or unusual behavior even when the main controller is healthy.
Step 1 — Visual inspection:
- Locate the light box — typically a small sealed board or module near the deck, wired separately from the main controller
- Inspect for burn marks, swollen or cracked casing, melted connectors, or corrosion (water intrusion is a common culprit)
- Check the connector pins — look for pushed-back pins, arcing discoloration, or bent contacts
- Power the scooter OFF and unplug the light box connector from the main harness
- Power the scooter back ON — does it behave normally now?
- If a scooter that previously wouldn't start now starts with the light box unplugged, the light box is shorting or causing parasitic drain → replace it
- On Apollo and similar scooters: the light box shares the main power feed — a failed light box can pull down bus voltage enough to prevent the controller from booting
- Reconnect the light box. Power ON. Probe the supply wire at the light box connector
- Expected: battery voltage (36V–52V typical) or regulated 12V depending on wiring — check model wiring diagram
- No voltage at connector = upstream fuse or wiring fault, not the light box itself
- Correct voltage in but lights still dead = light box board is failed internally → replace
- Power on and cycle through light modes (usually via power button press sequence or app)
- Confirm deck lights, underglow, and headlight effects all respond to mode changes
- Partial function (some zones dead) often means individual LED strips have failed, not the light box itself
✓ Pass: All zones light up and cycle through modes correctly · No burn marks or swelling · Unplugging light box does not affect motor or controller behavior
⚠ Fail: Scooter starts after light box is unplugged → light box is shorting · Burn smell or melted connector · Correct supply voltage in but no light output → replace light box · No supply voltage → trace wiring upstream to fuse/controller
💡 Apollo-specific note: On Apollo City, Pro, and Phantom models the light box is a separate PCB board. A common failure is moisture ingress at the deck connectors causing the board to short, which can prevent the scooter from powering on entirely — even with a fully charged battery. Always do the isolation test first before replacing the main controller.
6. Motor
—
Motor winding test
Connect E-bike tester to phase wires. Note number of lights lit (3 = healthy).
E-bike Tester Multimeter
🔄 Spin direction: Rotate the wheel forward (normal direction of travel) during this test. Hall sensors are timed for forward rotation — forward spin gives you the correct phase sequence and the clearest LED response.
E-bike Tester (bench test, no power needed):
- Connect E-bike tester to motor phase wires (Blue, Green, Yellow)
- Slowly spin the wheel forward by hand
- Count indicator lights — 3 lights = all phases healthy
- If only 1 or 2 lights appear, note which phase is missing — that winding or Hall sensor is suspect
- Measure voltage between – and BLUE Hall wire — should read 0V or 3–5V
- Repeat for GREEN and YELLOW Hall wires
✓ Pass: All 3 lights lit · Each Hall wire reads 0V or 3–5V
⚠ Fewer than 3 lights = open winding or bad Hall sensor on that phase · No lights at all = check tester connection to phase wires
Hall sensor test
Connect E-bike tester to Hall connector. Spin wheel forward — note number of lights lit (3 = healthy).
E-bike Tester
🔄 Spin direction: Always spin the wheel forward — the same direction the bike rides. Hall sensors are timed for forward rotation. Spinning backward will still trigger the sensors but gives a reversed phase order and can produce misleading results.
- Unplug the Hall sensor connector from the controller
- Connect the E-bike tester to the Hall sensor connector
- Slowly spin the wheel forward by hand at a steady pace
- Count how many Hall sensor LEDs light up — 3 = all sensors healthy
- Each LED corresponds to one Hall sensor (one per phase). A missing LED identifies the faulty sensor
✓ All 3 LEDs blink consistently as the wheel turns forward
⚠ 1 or 2 LEDs = that Hall sensor is dead or its signal wire is broken · 0 LEDs = check connector seating and tester connection · Erratic blinking = loose magnet or damaged sensor wire
7. Controls — Throttle, Brake Cutoff & PAS
—
Throttle test
Light illuminates progressively · Solid red at full throttle (E-bike tester) · Rest ≈ 0.8–1.2V, Full ≈ 3.5–4.5V (multimeter).
E-bike Tester Multimeter
E-bike Tester (bench test):
- Connect E-bike tester to throttle wires
- Slowly twist — light should progressively illuminate
- Full throttle — light should be solid red
- Record supply voltage between + and – wires
- Record signal voltage at rest between – and signal
- Record signal voltage at full throttle between – and signal
✓ Rest ≈ 0.8–1.2V · Full ≈ 3.5–4.5V
Brake cutoff switch — left lever
Press and release — indicator light toggles (E-bike tester) or continuity alternates (multimeter).
E-bike Tester Multimeter
E-bike Tester:
- Unplug brake lever, connect to RED pigtail on E-bike tester
- Depress and release — light should toggle on/off
- Unplug brake lever. Touch both pins.
- Depress and release — should alternate between beep and no beep
Brake cutoff switch — right lever
Same test as left lever. Both must function correctly.
PAS sensor (Pedal Assist)
Slowly rotate pedals — motor should engage smoothly at each PAS level. Signal wire pulses 0 → ~3–5V as magnets pass sensor. No response = check magnet disc, air gap, or signal wire.
E-bike Tester Multimeter
E-bike Tester — Bench Test (No Power Needed):
- Unplug the PAS sensor from the harness
- Plug the PAS sensor 3-pin connector directly into the E-bike tester's Hall sensor port
- The E-bike tester is self-powered (internal 9V battery) — no bike power needed
- Slowly wave or rotate the magnet disc past the sensor tip
- One of the Hall sensor LEDs on the E-bike tester should blink ON/OFF with each magnet that passes
✓ Pass: Hall LED blinks consistently with each magnet · No missed pulses or flicker
Multimeter — Bike Powered On:
- Power the bike on · Locate PAS connector (3-pin: Red/Black/Green)
- Set multimeter to DC voltage · Probe signal wire (Green) to ground (Black)
- Slowly rotate pedals — voltage pulses 0V ↔ 3–5V with each magnet
✓ Clear pulsing voltage as pedals turn · Motor engages at PAS 1+
Visual Check (do first):
- Count magnets on PAS disc — all should be present and evenly spaced (typically 5 or 12)
- Check air gap between sensor tip and disc — should be ≈ 1–3 mm. Too large = no signal
- Inspect sensor wire for pinching, cuts, or corrosion at connector
⚠️ Missing magnets or large air gap are the most common PAS failures — check these first before testing the sensor
8. Safety — Brakes, Tires & Lights
—
Brake function — front
Squeeze lever — firm feel, adequate stopping power, no rubbing when released.
Brake function — rear
Same check as front. Note any spongy feel or excess lever travel.
Tire pressure & condition
Check pressure and inspect sidewalls for cracks, cuts, or excessive wear.
Lights & reflectors
Test front light, rear light, and check all reflectors are present and secure.
Display & controls
Display powers on, all buttons respond, PAS levels change correctly.
🔧
Reassembly — Deck Seal Checklist
Before returning the scooter to the customer, confirm the following:
- All deck weather seals and gaskets replaced — do not reuse old or compressed seals
- Deck cover is fully seated with no gaps around the perimeter
- All deck screws torqued down evenly — do not overtighten
- Deck connector covers and grommets reinstalled and seated
- Wipe down deck edges and visually confirm no gaps before handing back
✅ Road Test & Final Sign-Off
Results are updated automatically as you rate items in the Inspection tab. Red items need immediate attention — Yellow items should be communicated to the customer.
🔴 Bad — Needs Immediate Attention
0
No urgent items — good work!
🟡 Monitor — Advise Customer / Service Soon
0
No monitor items.
🟢 Good — No Action Required
0
No items marked good yet.
🧰 Which Tool for Which Test?
| Test | E-bike Tester | Multimeter |
|---|---|---|
| Brake cutoff switch | ✅ Yes | ✅ Yes |
| Motor winding & Hall | ✅ Yes | ✅ Yes |
| Throttle | ✅ Yes | ✅ Yes |
| PAS sensor signal | ✅ Yes | ✅ Yes |
| Battery-to-controller continuity | ❌ No | ✅ Yes |
| Wire harness continuity | ❌ No | ✅ Yes |
| Controller MOSFET check | ❌ No | ✅ Yes |
| Voltage readings | ❌ No | ✅ Yes |
🛑 Brake Cutoff Switch Test▼
E-bike TesterMultimeter
E-bike Tester — Bench Test (No Power Needed)
- Unplug brake lever, connect to RED pigtail on E-bike tester
- Connect alligator clamps marked brake lever on E-bike tester
- Depress and release — light should toggle on and off cleanly
Multimeter — Continuity Mode (No Power Needed)
- Unplug brake lever
- Set multimeter to continuity mode
- Touch both pins simultaneously, press and release brake lever
- Should alternate between beep and no beep
⚙️ Motor Test▼
E-bike TesterMultimeter
E-bike Tester — Bench Test (No Power Needed)
- Motor winding: Connect E-bike tester to phase wires (Blue, Green, Yellow) — count lights
- Hall sensor: Connect E-bike tester to Hall connector — count lights
- All 3 lights = healthy · Fewer = fault on that phase/sensor
Multimeter — Bike Powered On
- Measure voltage between – (black) and + supply
- Measure – to BLUE Hall: should read 0V or 3–5V
- Measure – to GREEN Hall: should read 0V or 3–5V
- Measure – to YELLOW Hall: should read 0V or 3–5V
🎛️ Throttle Test▼
E-bike TesterMultimeter
E-bike Tester — Bench Test (No Power Needed)
- Connect E-bike tester to throttle wires
- Slowly twist — light progressively illuminates
- Full throttle — solid red light
Multimeter — Bike Powered On
- Record supply voltage between + and –
- Record signal voltage at rest (between – and signal wire)
- Record signal voltage at full throttle
✓ Rest ≈ 0.8–1.2V · Full throttle ≈ 3.5–4.5V
🚴 PAS Sensor Test▼
E-bike TesterMultimeter
E-bike Tester — Bench Test (No Power Needed)
- Unplug the PAS sensor from the harness
- Plug the PAS sensor 3-pin connector into the E-bike tester's Hall sensor port — PAS sensors use a Hall effect sensor and share the same pinout
- E-bike tester is self-powered by its internal 9V battery — no bike power needed
- Slowly wave or rotate the magnet disc past the sensor tip by hand
- Watch the Hall sensor LEDs on the E-bike tester — one should blink ON/OFF with each magnet that passes
✓ Pass: Hall LED blinks consistently with each magnet · No missed pulses or flicker
Multimeter — Bike Powered On
- Power the bike on
- Locate the PAS 3-pin connector (Red = 5V power, Black = ground, Green = signal)
- Set multimeter to DC voltage · Probe: Green signal wire to Black ground
- Slowly rotate the pedals by hand — voltage should pulse 0V ↔ 3–5V with each magnet passing
✓ Clear pulsing voltage · Motor engages at PAS 1+
Visual Inspection (Do This First)
- Inspect the magnet disc on the crank — all magnets should be present and evenly spaced (typically 5 or 12 magnets)
- Check air gap between sensor tip and disc — should be ≈ 1–3 mm. Bend tab closer if gap is too large
- Trace sensor wire from bottom bracket up to controller — check for pinching, cuts, or corroded connector pins
⚠️ Missing magnets or excessive air gap are the most common PAS faults — check before replacing the sensor
🔌 Wire Harness Check▼
VisualMultimeter
Step 1 — Visual Inspection
- Trace full harness — check for chafing, pinches, cuts, melted insulation, rodent damage
- Inspect every connector for bent/pushed-back pins, corrosion, cracked housings
- Confirm every connector is fully seated and latched
Step 2 — Wiggle Test (Bike On)
- Power on bike. Slowly flex harness 6 inches at a time.
- Any flicker or cutout = internal break at that location
Step 3 — Continuity Test (Battery Off)
- Disconnect battery. Set multimeter to continuity mode.
- Test each wire end-to-end — beep = good, no beep = broken
- Test between + and – on each segment — beep = short circuit
⚠ Key fault to watch for: Pushed-back pin in the battery slide connector causes the bike to run fine at full charge but cut off abruptly as voltage drops — the high voltage arcs across the gap, low voltage cannot. Inspect every pin height in the slide connector.
⚡ How to Discharge a Controller▼
Capacitors inside the controller store voltage even after the battery is disconnected. Always discharge before any bench testing or touching internal pins.
Method 1 — Capacitor Discharge Pen ✅ Recommended
- Slide battery off or disconnect the main battery connector
- Touch both probes of the discharge pen to the controller's B+ and B– terminals — polarity-free
- LED glows while discharging — wait for it to go dark (~9V or less)
- Confirm with multimeter before touching any pins
✓ Fastest and safest — clear LED "safe" signal, no sparking, works on all 36V–72V eBike systems
🛒 Capacitor Discharge Pen 1000V with LED Indicator — ~$10–15 on Amazon or Walmart
Method 2 — Power Button Bleed (no tools needed)
- Slide battery off or disconnect the main battery connector
- Press and hold the power/display button for 10–20 seconds
- Wait 5–10 minutes — caps can recover voltage slightly after initial bleed
- Verify with multimeter: DC voltage across B+ and B– should be near 0V
✓ No extra tools needed — use when discharge pen is not available
⚠️ Well-built controllers have internal bleed resistors — many budget units don't. Never assume it's discharged. Always verify with a multimeter before touching pins.
🖥️ Controller MOSFET Test▼
Multimeter only
Multimeter — Diode Mode (Controller Discharged & Disconnected)
- Discharge controller first (see procedure above)
- Disconnect controller from bike. Set multimeter to Diode mode
- Test – probe (Black) to Green, Yellow, Blue phase wires — note each reading
- Flip probes: Test + probe (Red) to Green, Yellow, Blue phase wires
✓ Pass: Diode reading in one direction only (typically 0.4–0.7V forward drop)
⚠ Fail: Reading in both directions or 0.000 dead short = shorted MOSFET → replace controller
⚙️ Motor 9-Pin Connector Configuration
| Wire | Function |
|---|---|
| Yellow (large) | Yellow Phase (motor power) |
| Blue (large) | Blue Phase (motor power) |
| Green (large) | Green Phase (motor power) |
| Red (small) | +5V Hall Power |
| Black (small) | GND (Ground) |
| Yellow (small) | Hall A |
| Green (small) | Hall B |
| Blue (small) | Hall C |
| White | Thermistor / Speed Sensor |
🖥️ Gemini Controller Wiring — All 30 Wires
| No. | Function | Wire Color |
|---|---|---|
| 1 | Power + | Red |
| 2 | Power – | Black |
| 3 | Ignition | Red |
| 4 | Motor Phase | Yellow |
| 5 | Motor Phase | Green |
| 6 | Motor Phase | Blue |
| 7 | Hall + | Red |
| 8 | Hall – | Black |
| 9 | Motor Hall | Yellow |
| 10 | Motor Hall | Green |
| 11 | Motor Hall | Blue |
| 12 | Throttle + | Red/White |
| 13 | Throttle Signal | Green/White |
| 14 | Throttle – | Black |
| 15 | High Brake | Yellow/Green |
| 16 | Meter Signal | Green |
| 17 | High Speed | Yellow/White |
| 18 | Negative | Black |
| 19 | Low Speed | Blue/White |
| 20 | Negative | Black |
| 21 | Double Voltage Option | Orange |
| 22 | Alarm – | Black |
| 23 | Alarm + | Red |
| 24 | Ignition Control | Orange |
| 25 | Moving Sensor | Green |
| 26 | Alarm Signal | Blue |
| 27 | Self Repairing | Yellow |
| 28 | Negative | Black |
| 29 | Reverse Gear | Brown |
| 30 | Negative | Black |
🔌 System Component Wiring Overview
| Component | Connector | Wire Colors |
|---|---|---|
| Battery (+/–) | Anderson/XT | Red · Black |
| Motor Phase (3×) | Bullet | Blue · Green · Yellow |
| Hall Sensor | SM-6Y (6-pin) | Red · Black · Yellow · Green · Blue · White |
| Throttle | SM-3Y (3-pin) | Red · Black · White (signal) |
| PAS Sensor | SM-3Y (3-pin) | Red · Black · Green |
| Brake Lever | 2-pin | Blue · Black |
| Display | Multi-pin | Red · Blue · Black · Green · Yellow |
| Front Light | 2-pin | Red · Black |
★ Reviews
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