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83 Eldorado, 90 Seville, 94 Concours
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469 Posts
Discussion Starter #1
My 83 Eldo is equiped with the twilight sentinal and the auto-dimmer options. The problem is that the system is stuck on high beam and will not dim. I have turned off the sentinal and tried manually. Is there a relay to check and where is it located? ...Anyone?
 

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83 Eldorado, 90 Seville, 94 Concours
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469 Posts
Discussion Starter #2 (Edited)
My research turned up that on 1983 eldorado's equiped with the guide-o-matic auto dimming option used a dimmer relay located near the fuse block.
The elect schematic's I located (see attachment) shows this relay just ahead of the headlights. The relay is approx 1" by 2" pluged into a 5 wire harness terminal. The relay consist of two functions, one is a small solinoid activated by the colum lever or photo-eye. The second is the switch controling the power to the headlights. (note: the highbeam is the normal contact). The solonoid windings get hot and tend to fail activating the switch to low beams.
The fact that this relay gets hot and locks the highbeam setting when it fails speaks for its shelf, ie; melted plastic / wires ect. / fire!! if not replaced and use of the headlights is continued.
I located thru my local GM Parts supplier a replacement at GM Vintage Parts. The orig part number on the relay matches the current order number (Guide#5969007 12v) and cost me about $60.00.
 

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1992 Sedan Deville, 1984 Lincoln Town Car
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759 Posts
Thanks for the info. Glad I don't own an 83 Eldo. my 92 deville has it's own share of expensive weirdness. :bonkers:
 

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83 Eldorado, 90 Seville, 94 Concours
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469 Posts
Discussion Starter #4
Thanks for the reply.
You think thats bad, my 94 Concorse Northstar with 114K miles hase a small headgasket leak. Can you spell "BIGBUCKS".
Been tring a low budget repair but it still heats up. New engine is out of the question.
Good luck with your 92's issues.
 

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83 Eldorado, 90 Seville, 94 Concours
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469 Posts
Discussion Starter #5
Wouldnt ya know it! After shelling out $60 for a new dimmer relay I found two at my local u pull. 3 bucks each. I grabed the twilight/auto dim headlight switch's as well. Good to have spares. I'm going to have to visit that place more often.:)
 
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