Only for small low-voltage wires like lights, brake sensors and the throttle. Remove the battery, match wire to wire by color, join with heat-shrink connectors, and seal.
A cut light or sensor wire is a common, fixable problem. The safe way is to join each wire to its matching color with a crimped heat-shrink butt connector, which seals out water. Before you splice, check whether a plug-in extension cable or replacement part exists. That's often easier and more waterproof.
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.
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.
Heat-shrink butt connectors
Join two small wires and seal out water in one step. Match the wire size.
Link coming soon
Wire stripper and crimper
Strips insulation cleanly and crimps connectors tight.
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.