In removing the old motor ECU, I've had to cut the old plug for ECU off. I've been working out what wires go where and labelling them.

The 12v power for the controls (motor start, emergency motor cutoff / horn / lights switch) all used to be produced from the motor ECU. So I have designed a new power system using the original wiring plus a 12v Lipo battery.

Also have designed a circuit for controlling the motor and ECU, which will be posted after I've tried it out. I am avoiding using any microprocessors in this bike I'm no programmer, and am doing everything with relay logic so it will be easy to repair and maintain without having a Github!