jimwill9

I'm having the following electrical problems on my 1986 Cab: Brake lights work ok until headlight switch is on; when headlight switch is on brake lights on all the time; license plate lights do not work; right turn signals do not work when headlight switch is on. All fuses ok. Should I just replace the headlight switch or should I test it. If I should test it, does anyone know the procedure. I'm lost with all the wires going to the switch. Thanks for any help you can provide.

Jim