Question about 1988 Ford F 150

1 Answer

Tail Light Problem

My tail lights are not working. the breaking lights are working. I have Checked the bulb and bulb is good. I have also checked the fuse and the fuse is good. Everything has omed out good. but they are still not working. i really need help on this.

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  • techa_ninna2 Feb 27, 2009

    I didnt have voltage on neither of my sockets. and i didnt have voltage on the connector under the truck. I took a test light and put on a ground (i used the frame) and we didnt have voltage. I know i should still have 12 volts whether i have a ground or not if i use a test light. But i dont have voltage.

  • techa_ninna2 Feb 27, 2009

    yeah i have power going for my blinkers and brake lights. my park lights dont work either. i even replaced the headlight switch because i thought it was the contact that went out at first.

  • techa_ninna2 Feb 27, 2009

    thanks. why would my brake lights work but dont have power for the tail lights? its all confusing.

  • techa_ninna2 Feb 27, 2009

    the pictures wont open for me either.

  • techa_ninna2 Feb 27, 2009

    What About a corroded Connection?

  • techa_ninna2 Feb 27, 2009

    thanks for all your. imma try all this. and if it doesnt work. i will let you know. and imma try go buy the guide later on


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If you get power at center terminal with a test light, (careful, don't touch side of socket.) then try grounding (clamping) test light to outside of socket (which is your ground for bulb) . If test light doesn't light, it's bad ground.

Posted on Feb 27, 2009

  • 2 more comments 
  • Mike Butler
    Mike Butler Feb 27, 2009

    Any power going to other marker lights on fenders? May be a trace/poke, back to switch deal. I'll see if I can narrow it down to which color wire you should be following. No fusible links under hood feeling weak is there?

  • Mike Butler
    Mike Butler Feb 27, 2009

    Oh, O.k. That was my next question, so switch has been replaced & there is power coming out of it for the tailights correct? I went to ( to see about a wiring diagram, but the pictures won't open for me. If you want to try, go here:

  • Mike Butler
    Mike Butler Feb 27, 2009

    Running lights & brake/signal lights are on a separate circuit/wire. Think of small trailer wiring for example. Flat 4 connection has 1 for left signal, 1 for right signal, & one for running lights, then 1 for ground. Have you double checked all fuses with your test light? Sometimes they aren't labelled properly. If you probe harness back near rear bumper, under truck, you can isolate which wire from there (ahead of connection). Do you have a power distribution box under the hood, and have already checked all them too?

  • Mike Butler
    Mike Butler Feb 27, 2009

    Sorry, yes a corroded connection could be the problem too, that's why I want you to probe for power ahead of the connection up under truck ahead of bumper.


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