Fix guide · Lights & wiring

E-Bike Headlight Not Working

Switch, plug, wire or the light itself

Quick answer

Make sure the light is switched on from the display, then check its plug and wire. If those are fine, test or replace the light, matching your bike's light voltage.

A clamp-on bike headlight. Many e-bike lights are wired to the bike instead and powered by its battery. Photo: Anton Ehrola, CC BY-SA 4.0, via Wikimedia Commons (resized)

Try this first

Free, and each takes under 5 minutes.

Switch it on from the display
Check if it's a separate light
Look for an error code

In plain English

Most e-bike headlights are powered by the bike's battery through the controller or display, and are switched on with a display button (your manual says which, often a long press). Some are separate, battery-powered lights. When a powered light stops working, the cause is usually the switch setting, a loose or wet plug, or a damaged wire.

Step-by-step checklist

Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.

1Switch it on from the displayFree Many displays turn the light on with a long press of a button. Your manual says which. A light symbol usually appears on the screen when it's on.
2Check if it's a separate lightFree If the light has its own battery or USB port, charge it. These aren't powered by the e-bike.
3Look for an error codeFree Some displays show a headlight error code when the light circuit has a fault. Look the code up on this site.
4Check the light's plug and wireEasy Switch off. Follow the light's thin cable to its plug, pull it apart, check for water or bent pins, and push it back together. Look along the wire for cuts, especially where the handlebars turn.
5Replace the lightModerate If the plug and wire are fine, the light has probably failed. Buy one that matches your bike's light voltage (your manual or the old light's label says), with the same plug.
6Repair a cut light wireModerate A cut light wire can be joined. See our guide to splicing a low-voltage wire.
7Have the controller testedShop job If the wiring checks out, the controller may be faulty. A shop can test it and replace it if needed.

Parts you might need

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Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.

E-bike headlight
Match the light voltage your controller supplies. Your manual lists it.
Link coming soon
Electrical contact cleaner spray
Cleans dirt and corrosion from connector pins and battery contacts.
Link coming soon
Heat-shrink butt connectors
Join two small wires and seal out water in one step. Match the wire size.
Link coming soon

Still not fixed?

Pages to try next:

When it's time for a shop: if you've worked through every step and the problem is still there, take the bike to an e-bike shop. Bring your notes on when it happens, plus the code.

Words on this page: Controller

Quick answer

Try this first

In plain English

Step-by-step checklist

Parts you might need

E-bike headlight

Electrical contact cleaner spray

Heat-shrink butt connectors

Still not fixed?