The electrical system of the Aermacchi Harley-Davidson M-65 from 1969, drawn circuit by circuit. Each wire is labelled with its colour.
Always check a wire with a multimeter before you connect it, and disconnect the battery first.
Circuit 1IgnitionThe black wire runs from the generator to the coil through the ignition switch. The same wire continues to terminal RU on the handlebar switch. The coil gives the spark to the plug.
Circuit 2LightingThe red wire goes to terminal A of the handlebar switch. Terminal B feeds the headlamp with the grey wire.
Circuit 3Tail light and clocksTerminal B of the handlebar switch also feeds the tail light, with the yellow wire.
Circuit 4Stop lightThe generator supplies the power. The green wire goes to the stop light and to the stop light switch. That switch connects the wire to earth.
Circuit 5HornThe red wire feeds the horn. The blue wire goes to terminal T− and the button.
Read this firstWatch out forUncertain colours and terminals
- This model has no battery. The generator feeds the lights directly.
- The inside of the handlebar switch is not shown in this diagram. Check with a meter which terminals are connected in each position.
- The book does not say how the horn button makes its earth. Check with a meter.
- In this diagram the coil has terminals AL and M. Terminal AL is earthed.
- The headlamp and the tail light are both on terminal B of the handlebar switch.
- The ignition switch sits in the black wire between the generator and the coil.
Our own drawings per circuit. The connections are based on the workshop manual for this model. Not an official publication of the manufacturer.