Whats wrong? Only your low beams work and no high beam? I found that on my 80 coupe there is a fusible link in the wiring harness close to the radiator support and it had melted causing the malfunction of the high beams. I replaced it with a in-line fuse and presto.
You might check the high beam dimmer switch on steering wheel or the connectors leading out from it.
At first the headlights went out then the high beams. I checked the fuse diagram and could not find the headlight fuse and before I continue to troubleshoot I would like to find out where this fuse is.
There are no fuses for just the headlamps. The light switch is powered through the TAIL LIC fuse (20 AMP), but if that was out, you wouldn't have any instrument panel lights. There is a circuit breaker in the light switch, and it only works the headlamps.
I don't believe the circuit breaker can be removed from the light switch, so you should just replace the whole assembly. I recommend getting an AC DELCO switch, because DELCO it OEM for all GM applications.
If replacing the switch doesn't resolve the issue, you may need to replace the sentinel amplifier (assuming your car has the Twilight Sentinel option). The amplifier is located behind the instrument panel, beneath the light switch.
You will have to remove that part of the dash to change the switch, yes. It is not really a difficult process. The screws are all pretty obvious, with the possible exception of the two on each side of the speedometer cutout. From there, the headlamp switch IIRC, is held in by two simple hex bolts.
^^If and when you do get to dismantling your dash to repair the failed circuits, be very gentle with all the small (9/32 head size) fasteners. They all screw into plastic which strips out very easily. Good luck.
Hey guys, I have a 1987 Cadillac brougham and my headlights are not turning on. My running lights work. I just installed a new headlight switch and nothing. So I decide to check the voltage and I’m getting power from the switch to the fuse box but nothing from the fuse box to the bulbs. Please let me know what you guys think. Thanks