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  1. #1
    Jr. Apprentice weswins's Avatar
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    Aug 2010
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    Default intermittant headlight failure on 1994 Silverado 1500 4x4

    I have a few noobish questions for the experienced guys out there.
    I have a 1994 Silverado1/2 ton 4x4 with power everything.
    Occasionally while the truck is running (at idle or driving) the low beams will turn off for a few seconds and then turn on as bright and solid as they should be. There is no flickering or dimming they justcompletely turn off. My park lights remain on and the high beam circuit seems to reset the low beams. I have held my fingers on the switch to see if its the relay falsely tripping but there is no feelable or audible click.
    What the Ford is going on here?!?

    On a possibly related note: my Voltage gauge is reading lower than what the charging system is actually maintaining. Once in a while it will read correctly but then after a few minutes begins reading around 9-10V when the truck is actually running about 14V.

    Any help is greatly appreciated.
    Full throttle is never enough!
    1994 Silverado Z71 1500 (everything but leather)

  2. #2

    Default

    HI, weswins:

    I would test the voltage in the feed to the headlight switch to see if you are getting correct voltage. As long as it is around 12 volts or higher with the ignition off, and around 13+ volts with ignition on, no issue with connection.

    However, a drop in voltage may indicate one of two conditions: 1) a short (grounding but not real good contact as would be the case in a full short) or 2) connection of the power wire is bad, such as a crimp connector is loose. I have traced issues like yours to a loose crimp connector in one case and a bad wire somewhere in about a 12 inch section. In the latter case, after narrowing it to that length of the run, I cut off the end and spliced in a new wire and connector.

    A voltage drop could still mean the headlights operate at least when the bad connection is not all the way disconnected, as long as it will throw the relay.
    1994 Chevy K2500 Silverado, 454 (modified), original owner.
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  3. #3
    Sr. Engineer
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    Default

    Does it do it with brights on?

  4. #4

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    Do they go completely dark or do they go really dim?
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