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(2) '81 FWBs, '86 Cutlass Supreme
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690 Posts
Discussion Starter #1
I've looked everywhere and can't figure this out, I have no low beams in my Brougham. The car's been parked in the garage for months and has been started not too long ago, and everything was well. Now there's no lights (and no fuse). I swapped the switch out and it's not that. What am I missing? A fusible link or something? I can't trace anything down through the service manual either. They're finally calling for decent weather and I can't even take this car to work! No sign of mice, I have poison in the car and nothing touched it, I'm stuck.
 

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1979 Sedan deVille d'Elegance
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4,153 Posts
I had the same problem with my 79 deVille a few years ago after the car was outside and unused for about 6 months. It turned out that, for whatever odd reason, all of the headlights were bad. Replaced them all and they are still good to this day.

If that doesn't fix your problem then maybe check the factory service manual.

Good luck Matt!!! :)
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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6,796 Posts
That's strange all the headlights would burn out at once. Does the dash still dim when you turn them on, does the tail lights and side markers still come on?
There should be a fuse, circuit breaker or fusible link for the headlights.
 

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(2) '81 FWBs, '86 Cutlass Supreme
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690 Posts
Discussion Starter #5
(on top of the column)
I'm not sure I know the switch?

All the lights in the whole car work, except the low beams and nothing dims or acts abnormal when I try to turn them on.
 

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2014 ELR
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9,728 Posts
Yes, that is how it started for me. First, the change between high and low would delay and go dark for a second. Then, the high beams quit. Then, no headlights at all. The dimmer switch was the problem. It is activated by the turn signal stalk, and connected to a rod that goes down the column. There is one electrical connection, and two nuts that hold it in place. You drop the hush panel, remove the two big nuts, lower the column to rest the wheel on the seat, then you can get at the switch. There will be a little pin that stays in place until you get the rod in, and the switch in the right spot with the nuts snugged down. Then, pull the pin. Switch is about 15 bucks.



 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
When you turn on the High beams do all 4 headlights come on? If so, I would suspect 2 bad low beam lights. Or the ground wires to the radiator support.
 

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(2) '81 FWBs, '86 Cutlass Supreme
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690 Posts
Discussion Starter #8
When I click on the high beams, just the high beams come on. But with a 12v test light it appears that I'm not getting power to the lows ever.
 

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84 Coupe w/500
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5,665 Posts
You can pull the connector off the switch that jay is talking about and apply power to the low beam wire.
 

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78 CDV, 79 CDV delegance, 80 CDV, 80 FWB 2dr delegance (rip)
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1,150 Posts
I had the same issue with my low beams on my 80 coupe. I checked my 80 service manual and just followed the path of where to check with a 12v tester. It was getting power at the headlight switch, at the dimmer switch at the firewall connector but when checked at the connectors for the lights no power, so I pulled out the wires of the wire loom and poked every inch of the low beam wire until I found the problem. Within the wiring, it has a fusible link which had gone bad. So in its place, I spliced in an in-line fuse, those from Autozone and presto, low beams work..
in the mean time what you can do is run a jumper wire to the high beams and connect to wire of low beams and turn your lights on and put on high beams, all 4 should light up, or run splice into the low beam wire and run a seperate hot wire into the dash and connect to a toggle switch an when you're driving at night, flick on switch and you have low beams.
I did this with my old Brougham Coupe I had and now going it again on my current Coupe but with the high beams..
 

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(2) '81 FWBs, '86 Cutlass Supreme
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690 Posts
Discussion Starter #12
I replaced the dimmer switch with no luck. Then I pulled a relay, just on a weird hunch and the hi beams went off. Swapped it for the one in the black car and it fixed it. Some big relay on a harness by itself stamped guide. Guidematic?
 

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78 CDV, 79 CDV delegance, 80 CDV, 80 FWB 2dr delegance (rip)
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1,150 Posts
Well thats good. Where was the relay at, maybe perhaps thats my issue with my high beams...low beams work though
 

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1981Cadillac Fleetwood Brougham D'Elegance Coupe m
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392 Posts
The guidematic also has a Power Relay which is near the fuse block..and a demand hi-beam relay.
 

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78 CDV, 79 CDV delegance, 80 CDV, 80 FWB 2dr delegance (rip)
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1,150 Posts
I fixed my high beams issue, turns out a fusible link within the wiring harness leading out of firewall towards front
of car was the problem. I used a jump wire and the hign beams came on, so I cut off the link and replaced with a in line
fuse that I made..and presto...high beams come on..
 

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(2) '81 FWBs, '86 Cutlass Supreme
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690 Posts
Discussion Starter #16
Took the car for a long ride today and used the headlights to get home and could smell burning the whole way. Smells like it's coming from the headlight switch. A few minutes after I turned it off it seemed to go away. The relay that "fixed" the lights was pretty hot, not enough to burn my hands, but hotter than I would think it should be.

And got the diagnosis that the trans is shot today. My buddy's got a pile of them for $50 if 4100's use the same 200 4r bellhousing. Just really don't have the time for this.
 
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