Truck shuts down when I turn on my lights switch

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Angelt6284, May 17, 2022.

  1. Angelt6284

    Angelt6284 Bobtail Member

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    I have a 1995 freightliner fld120 with a DDs60 and no matter if I’m driving or if I’m sitting still the truck will emergency shutdown when I turn on my lights. Barely started happening Monday and I took a week off before that. Both the check engine and emergency shutdown lights cmon on. When I drive all day without the lights on it runs perfectly fine but a minute or so after I turn the lights on it shuts down. I have no clue if this is simple or serious.
     
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  3. baha

    baha Road Train Member

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    Some one has been making changes in wires behind the dash??
     
    blairandgretchen Thanks this.
  4. blairandgretchen

    blairandgretchen Road Train Member

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    My only guess is that your light circuit is somehow tied into/rubbed into a low oil pressure switch or other critical shutdown event.

    If it has a diagnostic switch you can toggle that and read the 'blink codes' - better yet have it plugged in to see what the CEL/SEL codes were.

    It may help you isolate the problem.

    Report back please !
     
    cke and spsauerland Thank this.
  5. Angelt6284

    Angelt6284 Bobtail Member

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    No the truck sat for a week while I was at home.
     
  6. Angelt6284

    Angelt6284 Bobtail Member

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    Where would I take it to get the codes scanned? The dealer? I don’t have a scan tool
     
    blairandgretchen Thanks this.
  7. ZVar

    ZVar Road Train Member

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    Dealer sure, but any heavy diesel mechanic should have one that works with an engine that old. Call around and give the symptoms and see id they can diagnose it.

    Sounds like a bad ground somewhere, or a broken wire that is causing feedback when you turn the lights on. Don't expect it to be found right away, but on the same token the mechanic might get lucky too.
     
  8. Angelt6284

    Angelt6284 Bobtail Member

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  9. Angelt6284

    Angelt6284 Bobtail Member

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    I got the above pictures looking at the trucks relays and stuff and a bolt was broken securing a line coming from the batteries. Could that be it? And what’s the pats name that holds all those cables together?
     
    blairandgretchen Thanks this.
  10. blairandgretchen

    blairandgretchen Road Train Member

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    Go to your FL dealership with the VIN and that picture, I’m guessing you’ll need that whole block, unless those bolts are replaceable from the rear side.
     
  11. Angelt6284

    Angelt6284 Bobtail Member

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    Yea I’m trying to get home this weekend to fix this I’ll see if it’s the problem . Thank you guys.
     
    blairandgretchen Thanks this.
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