I have a 1970 Buick Wildcat convertible, the interior lights will not turn off. I have tried replacing both door jamb switches, but had no luck. I’m guessing it’* not the left switch because the car buzzes when the keys are in the ignition. I’m hoping it’* not the headlight switch. Any troubleshooting suggestions ?

thanks.

Does the headlight switch click?

There is no click from the headlight switch when I pull it or turn it to dim the lights.

With the door jamb switches disconnected from their respective wires, are the interior lights on?

I too suspect the headlight switch. Disconnect all wires from it and see if the interior lights stay on.

when I disconnect the door jamb switches, the lights stay on!

The switch should click on and off as you turn it. No click the switch is bad.