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ABS help, 2013 peterbilt 388

Discussion in 'Peterbilt Forum' started by cgsnipe, Jul 30, 2018.

  1. Jul 30, 2018 #1
    cgsnipe

    cgsnipe Bobtail Member

    34
    13
    Aug 26, 2012
    Alvin, TX
    0
    I purchased a 2013 peterbilt 388 from TMC. So far the truck has been great except for one thing. TMC for some reason wired the ABS through the yellow auxiliary pigtail and the dump valve switch through the center pin on the main pigtail wire. Is there an easy way to switch this back? I've been under the truck looking for a place to access the wires without cutting everything open. I'm sure they had to have switched them some place simple but i can't find it. any ideas would be greatly appreciated.
     
    cgsnipe, Jul 30, 2018
    cgsnipe, Jul 30, 2018
    #1
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  3. Aug 1, 2018 #2
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    The 7-way should go to the firewall plug, there should be a decal next to it that says, "Hood, Trailer, Spare, Chassis." You'll have a plastic cover held on by 3 screws. Pull that off an look in there. If no signs off messing with it there, I'd disconnect it and ohm out the 7 way cable from the fire wall to the trailer plug. That will tell you if that's still intact or spliced somewhere along the frame. If that's all intact and wired as OEM, then they did it under the dash.
     
    GrapeApe, Aug 1, 2018
    GrapeApe, Aug 1, 2018
    #2
    cgsnipe and QUALITYTRUCK Thank this.
  4. Aug 8, 2018 #3
    cgsnipe

    cgsnipe Bobtail Member

    34
    13
    Aug 26, 2012
    Alvin, TX
    0
    Do you have a picture of that connection on the fire wall?
     
    cgsnipe, Aug 8, 2018
    cgsnipe, Aug 8, 2018
    #3
  5. Aug 10, 2018 #4
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    That connection is the style on the previous 388s. A 2013 388 should have a chassis node on it. Some of the trailer wiring comes out the chassis node, some comes out the lower rectangle plug on the firewall.
    If you follow the trailer cords back there should be round plugs mounted under the sleeper/cab that they mount to. Might be able to switch the wiring at them. Last 6 of s/n for better info
     
    pushbroom, Aug 10, 2018
    pushbroom, Aug 10, 2018
    #4
    spsauerland and cgsnipe Thank this.
  7. Aug 10, 2018 #5
    cgsnipe

    cgsnipe Bobtail Member

    34
    13
    Aug 26, 2012
    Alvin, TX
    0
    Last six is 202204. I appreciate the help. I don't know why they would wore these things this way. I thought the abs had to be wired to the center pin on the main pigtail.
     
    cgsnipe, Aug 10, 2018
    cgsnipe, Aug 10, 2018
    #5
  8. Aug 10, 2018 #6
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    Wiring diagram attached. Looks like pins u and t will need to be switched.
     
    pushbroom, Aug 10, 2018
    pushbroom, Aug 10, 2018
    #6
    spsauerland and cgsnipe Thank this.
  9. Aug 10, 2018 #7
    pushbroom

    pushbroom Road Train Member

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    Forgot to attach
     

    Attached Files:

    pushbroom, Aug 10, 2018
    pushbroom, Aug 10, 2018
    #7
    cgsnipe Thanks this.
  10. Aug 10, 2018 #8
    cgsnipe

    cgsnipe Bobtail Member

    34
    13
    Aug 26, 2012
    Alvin, TX
    0
    I have looked all over the fire wall and can't find that plug or the wiring harness 92-8471. If I do find them, will it be as simple as moving the pins in the plug?
     
    cgsnipe, Aug 10, 2018
    cgsnipe, Aug 10, 2018
    #8
  11. Aug 10, 2018 #9
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    It will be located in the frame rail under the sleeper/ cab. Follow the trailer cords back from the socket
     
    pushbroom, Aug 10, 2018
    pushbroom, Aug 10, 2018
    #9
    spsauerland Thanks this.
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