1985 Cutlass supreme headlight switch replacement instructions and tutorial. I am not liable for anything. Do this at your own risk. And edit the screws could be 7mm or 9/32in. Also check wiring to starter, there is a fusible link there that is related to this headlight switch.
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what kind of radio do you have
also from my understanding these switches have circuit breakers in them so they should never really break so check wiring and make sure your starter wires are ok.