Hello Dean.
There is no fuse for the headlights as there is a circuit breaker in the headlight switch itself.
Normally a circuit breaker will still allow the lights to come on and go out when the breaker overheats.
it is possible you have a bad positive voltage supply to the switch or a bad dimmer switch.
I remember GM cars from that time period having problems with dimmer switches.
Check for power on the yellow wire that goes into the dimmer with the headlight switch on, then the tan wire on low beam and the light green on high beam.
If yellow has power but the other two do not the dimmer switch is bad.
If the yellow has no power the problem is the headlight switch or the power supply to it.
The dimmer is mounted on the left side of the steering column just above the brake pedal and is activated by a rod that comes down from the signal/dimmer lever.
Try not to let the rod slide down and out of that lever if you change the switch.
Hope this helps you find your problem.
Take care.
KL
Dean
If you have not already, by all means yes, check for power at the headlight sockets and also the grounds.
I have seen both headlights burned out many times in my career.
If you need to replace the dimmer none of the steering column needs to come apart but you may need to remove the lower dash panel to access the switch. Just don't let the rod slide out of the upper part of the column. The switch is screwed to the column just above the brake pedal( approximately).
Just to make it clear to you the forward/backward movement of the lever moves a rod that extends down the side of the column over a foot long to the dimmer switch.
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I'm helping a friend of mine fixing this problem. She says her headlights were stuck on bright, so the dimmer switch hasn't been working for a couple of years now. She unplugged her bright light bulbs to fix that problem. Also that dimmer switch (Forward & Back) is also her turn signal switch (Up & Down). So, I suppose, I'm going to have to dismantle some of the steering column to expose the dimmer / turn signal switch wiring to put my Multi-Meter on, right??? Or can I open up the hood and test the wires at the headlight plugs???
Dean
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