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Thread: No headlights

  1. #1
    Fuel Injected! Xenon's Avatar
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    No headlights

    Well, continuing to chase electrical gremlins on this truck. The first time I tried the headlights after I did the tbi conversion they came on for a second and then died. I now have no headlights or parking lights or tail lights but turn signals and brake lights work.

    Took the switch out and there is no power to it. The wire that comes in from the jct block on the firewall has power through the fusible link and all the way to the bulkhead. It seems to go dead somewhere under the dash but it is my understanding that the wire goes directly to the headlight switch once it comes through the firewall...

    Any ideas? I'd trace the wire from the firewall to the switch but there is really no room under the dash to do anything...

    Thanks.
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

  2. #2
    RIP EagleMark's Avatar
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    Fuse...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #3
    Fuel Injected! Xenon's Avatar
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    Fuses all look good...
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

  4. #4
    Fuel Injected! Xenon's Avatar
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    The horn and radio don't work either... Radio just worked yesterday...
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

  5. #5
    Fuel Injected! Xenon's Avatar
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    Well after tearing down the dash and manually tracing every inch of the offending wire, I found that it was the same wire I posted a thread about wondering what it was. It was kinda out of place and I thought it was an old dual battery wire or something from the old truck... Turns out it is supposed to be hit all the time. Hooked it to the jct block on the firewall and all is well.

    Just thought I'd document that for someone in the future. And the wire in question is the top left wire on the bulkhead connector, it's a large-ish red wire.
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

  6. #6
    RIP EagleMark's Avatar
    Join Date
    Feb 2011
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    At least you fixed 2 problems...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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