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Trailer Auxiliary Power Switch

Discussion in 'Flatbed Trucking Forum' started by CDLman63, Feb 21, 2021.

  1. Feb 21, 2021 #1
    CDLman63

    CDLman63 Bobtail Member

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    Apr 22, 2018
    Hattiesburg, MS
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    I drive a 2021 International LT 625 pulling a 48-ft flatbed. I have a Trailer Auxiliary Power switch in my truck. I looked through the operator’s manual, but couldn’t find information on this. What is this switch for?
     
    CDLman63, Feb 21, 2021
    CDLman63, Feb 21, 2021
    #1
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  3. Feb 21, 2021 #2
    Dave1837

    Dave1837 Road Train Member

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    Nov 16, 2019
    Pennsylvania
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    Probably an ABS or dump valve switch. Did you try flipping the switch? If you did, did you hear any clicking or air dumping from the trailer?
     
    Dave1837, Feb 21, 2021
    Dave1837, Feb 21, 2021
    #2
    CDLman63 Thanks this.
  4. Feb 21, 2021 #3
    staceydude

    staceydude Road Train Member

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    Go test your pins on truck to trailer connection. Flip that switch and see if anything changes on pins. Like Dave said probably a dump valve or ABS
     
    staceydude, Feb 21, 2021
    staceydude, Feb 21, 2021
    #3
    CDLman63 Thanks this.
  5. Mar 29, 2024 #4
    Lotam

    Lotam Bobtail Member

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    Mar 29, 2024
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    Very late to reply here. Hope this helps someone.

    I drive a similar truck. In my case, this switch charges the batteries that power my trailer's tail gate. I would use a 4th line on a previous truck.
     
    Lotam, Mar 29, 2024
    Lotam, Mar 29, 2024
    #4
    lester Thanks this.
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