E-BIKE DIAGNOSTICS / NO GUESSWORK
Your e-bike
has a problem.
Don't buy another part yet.
Find the fault with practical tests, real measurements and step-by-step troubleshooting.
test it → understand it → fix it!
01 / START HERE
What is the bike actually doing?
Find the box that matches your problem.
NO POWER
Bike won't turn on
→
NO DRIVE
Display works, motor doesn't
→
CUTTING OUT
Power disappears under load
→
NO CHARGE
Battery won't charge
→
NO INPUT
PAS / throttle doesn't work
→
Match the problem. Work the tests. Rule things out.
02 / RUN THE TESTSA few simple tests can save
A few simple tests can save
you a box full of wrong parts.
CASE 004 / MOTOR DOESN'T RUN
Before replacing the motor:
Battery / at rest51.8 VPASS
Controller / input51.7 VPASS
Controller / 5V rail0.0 VFAIL
WHAT THAT TELLS USLook at the controller / wiring.The motor hasn't failed this test. Don't replace it yet.
LOOKS FINE...
03 / NARROW IT DOWN
Diagnosis is elimination.
Rule things out until only the fault is left.
- ObserveSee exactly what the bike is doing and what it isn't.
- MeasureTest the likely trouble spots and rule them out one by one.
- DecideKnow what failed before you spend money on parts.
WHAT WE COVER
Systems & components we troubleshoot.
FREE / PRINT IT / KEEP IT
Start with the checklist,
Start with the checklist,
not the shopping cart.
A quick diagnostic sequence for narrowing down common e-bike electrical faults before spending money on parts.
No spam. Just the checklist and useful diagnostic material.