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Thread: Headlights going out!

  1. #1
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Headlights going out!

    Anyone have any ideas why the headlights randomly go out on a 1990 Dodge Shadow C/S?
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  2. #2
    boostaholic
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    Re: Headlights going out!

    cheap filament in the bulb??

  3. #3
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Brand new headlight housings,bulbs,headlight switch,dimmer switch,and checked and cleaned headlight ground. I have not checked all of the wiring. It would be nice to have a very good wiring diagram for the headlights!
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  4. #4
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Headlights going out!

    I'll see what I can do.

  5. #5
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Headlights going out!






  6. #6
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Thanks!
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  7. #7
    Hybrid booster
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    Re: Headlights going out!

    Can you be a little more specific with your problem. I have been fighting a headlight problem on my 85 GLH.

    Mine is only a problem if I try to use the fog lights, after about 20mins all the exterior lights go out and sometimes the dash. it will then come back on in about 10 secs then go back off. This will continue until I shut off the car for a while. Also if I dont turn the fog lights on it does not happen.

    The last time it happened I was able to play around with the headlight switch and was pretty confident it was the cause of the problem. I plan on buying a new headlight switch and maybe running a relay for the headlights to help prevent this problem.

    Let me know what you find.

  8. #8
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by PunKid View Post
    Can you be a little more specific with your problem. I have been fighting a headlight problem on my 85 GLH.

    Mine is only a problem if I try to use the fog lights, after about 20mins all the exterior lights go out and sometimes the dash. it will then come back on in about 10 secs then go back off. This will continue until I shut off the car for a while. Also if I dont turn the fog lights on it does not happen.

    The last time it happened I was able to play around with the headlight switch and was pretty confident it was the cause of the problem. I plan on buying a new headlight switch and maybe running a relay for the headlights to help prevent this problem.

    Let me know what you find.

    I will be driving along and the headlights will just quit working. It's been awhile since I have driven the car but I think I could just turn the headlight switch off then back on and then they would work for awhile again
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  9. #9
    boostaholic
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    Re: Headlights going out!

    does the 90 shadow have the headlight delay setup when you turn them off??

  10. #10
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by 22shelby View Post
    does the 90 shadow have the headlight delay setup when you turn them off??
    Not that I'am aware of.
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  11. #11
    Supporting Member II Turbo Mopar Contributor shackwrrr's Avatar
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    Was the plug melted for the headlight switch? Could still be a bad connection there.
    Ian Adams

    Function>Form

    1990 shadow
    scrapped, too rusty

    1991 Spirit R/T
    Scrapped, parts sold

    1989 Turbo Caravan
    Daily beater with built-ish ​engine slowly evolving into weekend turbo beater.

  12. #12
    Hybrid booster
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    Re: Headlights going out!

    Headlight relays are never a bad idea on these cars. Most of the cars from our era have issues with the headlight switches overheating, or just failing from fatigue. Relays take the load off of the switch and give the headlights much cleaner voltage.

  13. #13
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by Tbird232ci View Post
    Headlight relays are never a bad idea on these cars. Most of the cars from our era have issues with the headlight switches overheating, or just failing from fatigue. Relays take the load off of the switch and give the headlights much cleaner voltage.
    Yea, I thought about rigging up a relay for the headlights.
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  14. #14
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by glhs875 View Post
    Yea, I thought about rigging up a relay for the headlights.
    Do it. I did that to my 90' Shadow and I can't believe the difference it made. I should have done it much sooner.

  15. #15
    Supporting Member II Turbo Mopar Contributor shackwrrr's Avatar
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    Quote Originally Posted by cordes View Post
    Do it. I did that to my 90' Shadow and I can't believe the difference it made. I should have done it much sooner.
    Did the same with my van. I now have comparable headlights to newer cars on the road.
    Ian Adams

    Function>Form

    1990 shadow
    scrapped, too rusty

    1991 Spirit R/T
    Scrapped, parts sold

    1989 Turbo Caravan
    Daily beater with built-ish ​engine slowly evolving into weekend turbo beater.

  16. #16
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by shackwrrr View Post
    Did the same with my van. I now have comparable headlights to newer cars on the road.
    Did u put the relay before or after the headlight switch?
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  17. #17
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Headlights going out!

    Quote Originally Posted by glhs875 View Post
    Did u put the relay before or after the headlight switch?
    What do you mean?

    http://www.danielsternlighting.com/t...ys/relays.html

  18. #18
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    That will work! Thanks!
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

  19. #19
    Garrett booster
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    Re: Headlights going out!

    Quote Originally Posted by Tbird232ci View Post
    Headlight relays are never a bad idea on these cars. Most of the cars from our era have issues with the headlight switches overheating, or just failing from fatigue. Relays take the load off of the switch and give the headlights much cleaner voltage.
    +2 I use to go thru headlight switches all the time until I changed to running relays All old mopars use thin wire for everything.Take a walk in the Pick and pull and look at all the newer cars they have relays and heavy gauge wire on every circuit and grounds everywhere .

  20. #20
    Supporting Member Turbo Mopar Contributor glhs875's Avatar
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    Re: Headlights going out!

    What is that circuit breaker on the headlight switch diagram?
    87 GLHS #875
    #3 quickest TD in the 1/8th on street radials


    8.33@89+mph (1/8th)-w/1.96 60' (staged boost-20psi max)-run made on street radials (300 treadwear)
    2.2 G head-SC6152 turbo-auto trans.
    Car sold! (body only)
    New project in the future.

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