Strange fourtrak f75 overrun?

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Just picked up another fourtrak earlier.

When the engine is running and the lights are on, you can take out the key and the ignition still seems to be switched on like the key is still in, the engine still runs.

But when you turn the headlights off, the engine switches off????

If the lights are off it turns on and off fine.

Strange one, any ideas??

thanks

Most likely a shorted wire

Most likely a shorted wire between the ignition main feed output wire and the headlamp feed wire, or someone has bodged the wiring at sometime.