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Ground issue, maybe?

Discussion in 'Peterbilt Forum' started by blessed2b, Sep 16, 2016.

  1. Sep 16, 2016 #1
    blessed2b

    blessed2b Bobtail Member

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    Jun 1, 2014
    0
    07 Pete 340 cummins ISC 8.3L...ac works great until I turn on headlights or clearance lights, then just blows hot air...I can turn it on defrost & then compressor kicks in fine & blows cold out defrost vents but then I turn on ac switch & I lose instrument panel lights...unedumacated guess is a ground issue but I'm not sure where to check...I'm a decent parts changer but not a technician nor electrician & not real keen on reading a schematic even if I had one...any hints on where to check connections or any other help would be GREATLY appreciated, these hot Texas nights are killing me.
     
    blessed2b, Sep 16, 2016
    blessed2b, Sep 16, 2016
    #1
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  3. Sep 18, 2016 #2
    beemergary

    beemergary Light Load Member

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    Apr 11, 2014
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    Doesn't sound like a part changer job. Also can't believe a ground problem. Can't think how one could backfeed into another. Someone been splicing into wireing?
     
    beemergary, Sep 18, 2016
    beemergary, Sep 18, 2016
    #2
  4. Sep 19, 2016 #3
    DL550CAT

    DL550CAT Road Train Member

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    Waynesburg, Pa
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    Strange problems like that are very much a sign of a ground issue. Not saying that is what your problem is.

    I'd look around behind the dash. If you can't find anything I'd try grounding the panel lights with a jumper to a known good ground. See if that changes anything.
     
    DL550CAT, Sep 19, 2016
    DL550CAT, Sep 19, 2016
    #3
    blessed2b Thanks this.
  5. Sep 19, 2016 #4
    cdub304

    cdub304 Light Load Member

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    Dec 7, 2009
    Rockford,IL
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    take dash down and check wires...... sounds like you got a bare wire somewhere. trace wire lights n ac switch more than likely thats your problem
     
    cdub304, Sep 19, 2016
    cdub304, Sep 19, 2016
    #4
    blessed2b Thanks this.
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