All outside lights stop working

Discussion in 'Kenworth Forum' started by Rev B, May 22, 2021.

  1. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    I have an 09 t800. After a short time running all exterior lights stop working but interior lights, radio, cig lighter keep working. I loose headlights, turn signals, flashers, and running lights. I can shut down and disconnect the batteries then restart and they will work for a little while then stop. Happens if the headlights are on or off. Where to look?
     
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  3. God prefers Diesels

    God prefers Diesels Road Train Member

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    Look for a short somewhere. It's tripping your breaker, and it resets when it cools down. Broken wire somewhere is grounded out, or loose strands grounding in pigtail, etc.
     
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  4. shooter19802003

    shooter19802003 Road Train Member

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    I would also put your hand on top of your Fuse box. Touch everything individually. See if anything is getting hot. Might also have a relay going bad. If not, it might help identify the circuit.
     
  5. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    Relay was my first guess but I can't find any one point where all the lighting is controlled. Everything is on separate fuses. Didn't know if there was a low voltage sensor or external relay hidden somewhere. I'm trying to find a wiring diagram for the truck.
     
  6. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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  7. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    Checked all the hinged points and can't find any worn spots. Should have mentioned, this is a dump truck. No trailer connections. I can't find any one point that could cut power to all lights, turn signals, and e flashers at the same time.
    Thanks for the ideas
     
  8. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    I'm new to the forum. Still learning how to work the replies. Bare with me, I'll get it eventually.
    Thanks for the help.
     
  9. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Research the term "Kenworth chassis node"
     
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  10. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    Thanks. Will do.
     
  11. Rev B

    Rev B Bobtail Member

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    May 22, 2021
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    I did some digging into the chassis node. That thing is expensive and unnecessary it looks like to me. Over engineering?
    I found a 70A relay for accessories that was getting hot and failing. Changed it and problem has gone away for now. Will see how long it last.
    Thanks for all the help.
     
    w9l and QUALITYTRUCK Thank this.
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