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Abs light on trailer inoperable

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Rideandrepair, Oct 25, 2018.

  1. Oct 25, 2018 #1
    Rideandrepair

    Rideandrepair Road Train Member

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    No power to bulb pulled front receptacle with pigtail plugged in and blue wire hot all other on 7 pin work correctly . My question is there are an extra 3 wires white wires 2 thin 1 thicker. Wondering if these should be hot? Maybe 2 wires to sensors? And 1 wire for light ?
     
    Rideandrepair, Oct 25, 2018
    Rideandrepair, Oct 25, 2018
    #1
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  3. Oct 25, 2018 #2
    Rideandrepair

    Rideandrepair Road Train Member

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    Receptacle is breaker type
     
    Rideandrepair, Oct 25, 2018
    Rideandrepair, Oct 25, 2018
    #2
  4. Oct 25, 2018 #3
    Rideandrepair

    Rideandrepair Road Train Member

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    2 thin and 2 thicker wires
     
    Rideandrepair, Oct 25, 2018
    Rideandrepair, Oct 25, 2018
    #3
  5. Oct 26, 2018 #4
    JohnC123

    JohnC123 Light Load Member

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    I have a Wabco controller wiring chart at work and if I remember correctly (I need to review myself) one of the wires that need to go to the abs light itself will be white with thin green slanted "hash marks" printed on it. Not sure if that's a controller power wire (for the light when it detects a problem) or a controller ground. I will verify and re-post the correct information for you. Sorry not much help.
     
    JohnC123, Oct 26, 2018
    JohnC123, Oct 26, 2018
    #4
    Rideandrepair Thanks this.
  7. Oct 26, 2018 #5
    Rideandrepair

    Rideandrepair Road Train Member

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    Great help thanks. Bought new breaker type receptacle. Looks like the 4 extra wires are grounds. Can’t find diagram for power to light. Thanks again.I got light for Tractor working.Now got to figure out how to get it to go off. Lol.Trailer was diagnosed a while back with open circuit on left wheel I pushed sensor in and worked for about 10 minutes and light came back on.Truck light on remains mystery.
     
    Rideandrepair, Oct 26, 2018
    Rideandrepair, Oct 26, 2018
    #5
  8. Oct 19, 2019 #6
    Rideandrepair

    Rideandrepair Road Train Member

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    Update for anyone that’s interested. I had replaced the bulb in dash, and found the supply harness going to Trucks rear brake module/ valve to be chafed. Replaced harness, problem fixed. Trailer same issue. Power supply harness, the one that hangs with air likes under trailer, along with a broken wheel sensor wire. What seemed like a big mystery, was amazingly easy to fix.
     
    Rideandrepair, Oct 19, 2019
    Rideandrepair, Oct 19, 2019
    #6
    Tx Countryboy Thanks this.
  9. Oct 19, 2019 #7
    Rideandrepair

    Rideandrepair Road Train Member

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    36192656-D944-43EC-958E-1E7B578458EC.png Abstroubleshooting.com. Wabco codes
     
    Rideandrepair, Oct 19, 2019
    Rideandrepair, Oct 19, 2019
    #7
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