Wiring Guide #3: Full Electric Motorcycle Wiring — The Complete System
Here's how power actually flows through an electric motorcycle build, block by block:
- Battery pack (battery+ and battery−) feeds the main contactor, then the key/ignition switch — that switch is what wakes the whole system up.
- Switched power goes to the motor controller. The controller drives the hub motor through the phase output and reads the motor's hall sensors (hall 5V line).
- Throttle signal and brake cut-off wires run from the handlebar switches into the controller — twist the throttle to spin, pull a brake lever and power cuts instantly.
- A DC-DC converter taps the battery pack and drops it down to 12V, feeding a 12V fuse block that runs the headlight, taillight/brake light, turn signals, and horn. The high-voltage drive side and the low-voltage accessory side stay separate.
- The display runs off the controller's display data line — if your screen is dead, check the controller's power-in and that line before blaming the display itself.
Wire colors vary by controller and manufacturer, so always confirm against your controller's label before connecting anything.
Questions on your build? Get in touch or swing by the shop — happy to walk you through it. ⚡