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No power to left turn signal on trailer or at fuse box on tractor.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Edjahman, Mar 8, 2020.

Page 1 of 2
  1. Mar 8, 2020 #1
    Edjahman

    Edjahman Medium Load Member

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    I have a 2018 Peterbilt 579 and recently it was blowing fuses for the left turn signal on the trailer.

    The fuse for this, strangely enough, is in the fuse box on the firewall of the tractor.

    For several days, I thought it was in the trailer and had it looked at several times.

    Finally, it quit working altogether and it has no power at the fuse box or the trailer cord. I traced it from the rear up to where the DEF tank is located and it's also with no power.

    I'm assuming it's a completely broken circuit at this point and I'm sure it's in between where the DEF tank is and the fuse box on the firewall.

    I've never seen anything quite like this before.

    Does anyone here have experience with this sort of thing? Any ideas?

    It's looking like I'll have to go to Peterbilt unfortunately.

    Thank you
     
    Edjahman, Mar 8, 2020
    Edjahman, Mar 8, 2020
    #1
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  3. Mar 8, 2020 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Probably yes on the dealer.
    A little different model but one here had a bad control module. It is mounted on the drivers side frame rail behind the transmission. If spsaucerland and or GoodySnap come along they probably have better information. Module cost about $900 which would be an expensive pot shot without having everything tested first.
     
    BoxCarKidd, Mar 8, 2020
    BoxCarKidd, Mar 8, 2020
    #2
    Edjahman Thanks this.
  4. Mar 8, 2020 #3
    Edjahman

    Edjahman Medium Load Member

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    OK thank you.

    Obviously I'm out of service and I guess I'll go to Peterbilt in the morning.
     
    Edjahman, Mar 8, 2020
    Edjahman, Mar 8, 2020
    #3
  5. Mar 9, 2020 #4
    Judge

    Judge Road Train Member

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    Mar 19, 2014
    Arkansas
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    Just remember the hand signals, yes they’re still a legal form, or you could get a ticket, turning without a signal/improper lane change..$138 in Arkansas..
    9D5F3099-437E-446D-B459-959B92FC2A0B.png
     
    Judge, Mar 9, 2020
    Judge, Mar 9, 2020
    #4
  7. Mar 9, 2020 #5
    spsauerland

    spsauerland Road Train Member

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    May 31, 2010
    West Harrison, In
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    If you need a wiring diagram please post last six of VIN.
     
    spsauerland, Mar 9, 2020
    spsauerland, Mar 9, 2020
    #5
    SAR, pushbroom and Edjahman Thank this.
  8. Mar 9, 2020 #6
    Deere hunter

    Deere hunter Road Train Member

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    Shallowater Texas
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    Tail lights on truck especially after winter running are a problem spot for me!
     
    Deere hunter, Mar 9, 2020
    Deere hunter, Mar 9, 2020
    #6
  9. Mar 9, 2020 #7
    Edjahman

    Edjahman Medium Load Member

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    Thank you for offering. Peterbilt is tearing the harness apart because they can't find it so I'm really boned.


    Yeah happy Monday.

    Thank you for your reply!
     
    Edjahman, Mar 9, 2020
    Edjahman, Mar 9, 2020
    #7
    Deere hunter and spsauerland Thank this.
  10. Mar 11, 2020 #8
    Edjahman

    Edjahman Medium Load Member

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    It was in the harness around the transmission. Wiring rubbing together.

    It cost a ton of labor to finally find it.

    Can't drive around with no left turn signal on the trailer though lol.

    Thank you for your reply!
     
    Edjahman, Mar 11, 2020
    Edjahman, Mar 11, 2020
    #8
    BoxCarKidd Thanks this.
  11. Mar 12, 2020 #9
    Deere hunter

    Deere hunter Road Train Member

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    Shallowater Texas
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    Wiring is always so labor-intensive but sure glad to hear you got it fixed and back on the road happy trails!!!
     
    Deere hunter, Mar 12, 2020
    Deere hunter, Mar 12, 2020
    #9
    Edjahman Thanks this.
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