75 deville headlights fail
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The Classic Cadillac Forum Discussion, 75 deville headlights fail in Past Cadillac Vehicle Discussion; As I was driving to school tonight the headlights on my deville shut off. All other lights are working. Owners ...
  1. #1
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
    Automobile(s): '75 Sedan DeVille
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    75 deville headlights fail

    As I was driving to school tonight the headlights on my deville shut off. All other lights are working. Owners manual says check headlight wiring. Any suggestions to narrow that down a bit?

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  3. #2
    carnut is offline Cadillac Owners Master
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    Re: 75 deville headlights fail

    Do the high beams work? When on high beam, are all 4 headlights on?

  4. #3
    77CDV's Avatar
    77CDV is offline Cadillac Owners Master
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    Re: 75 deville headlights fail

    Sounds like the fusible links burned through. They run along the passenger side of the engine very near the manifold. As they age and the insulation become compromised, the heat from the manifold melts them, resuting in no headlights. Great design there, GM!
    CADforce69 and CADforce69 like this.

  5. #4
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    Re: 75 deville headlights fail

    Quote Originally Posted by carnut View Post
    Do the high beams work? When on high beam, are all 4 headlights on?
    actually they do all work on the high beams. is it something with the dimmer switch? I think the guy who had it before me replaced it but I think he did it himself

  6. #5
    carnut is offline Cadillac Owners Master
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    Re: 75 deville headlights fail

    Could be? Voltage goes to the dimmer then to the headlight switch. With a test light, do you have voltage to the dimmer switch? All 4 lighting up means you either have 2 burnt out low beam filiments or no power to them thru the dimmer switch. ( most likely)

  7. #6
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    Re: 75 deville headlights fail

    probably not two burnt out low beams, just replaced one of them last week...I will check out the dimmer switch..bet that's it! thanks!!

  8. #7
    shwhitley's Avatar
    shwhitley is offline Cadillac Owners Member
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    There were two wires coming from the dimmer switch that had come loose. Fixed now. Thanks for the info!!'

  9. #8
    carnut is offline Cadillac Owners Master
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    Re: 75 deville headlights fail

    Thanks for posting back with the fix!

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