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Trailer Hot line?

Discussion in 'Ask An Owner Operator' started by Hanadarko, Jun 18, 2012.

  1. Jun 18, 2012 #1
    Hanadarko

    Hanadarko Independent Owner/Operator

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    So while I was troubleshooting the lack of power in my tractor 7-wire BLUE center, I had thought
    it would be tied to the fuse marked "TRAILER HOT LINE".

    However, this wasnt the case. It ended up being a fuse within the engine compartment on my 99 KW.

    So, any clues on what the "TRAILER HOT LINE" circuit might be for?
    Someone did relabel the fuse box and added this but I dont have any switch on the dash, nor a spare wire
    labeled accordingly inside the dash.

    Also, there is nothing external I can find and the prior owner told me he had no clue.

    Thoughts?

    -JD
     
    Hanadarko, Jun 18, 2012
    Hanadarko, Jun 18, 2012
    #1
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  3. Jun 18, 2012 #2
    Autocar

    Autocar Road Train Member

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    The Hot Rod Shop Oxford, AL
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    All late model trucks have this hot to power the trailer ABS. My tire inflation system is also powered off the center pin.
     
    Autocar, Jun 18, 2012
    Autocar, Jun 18, 2012
    #2
    windsmith Thanks this.
  4. Jun 18, 2012 #3
    Hanadarko

    Hanadarko Independent Owner/Operator

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    Right, but I can take OUT the fuse labeled "TRAILER HOT LINE" and I still have pin 7 power......so I figured it must be something added but
    haven't figured out what..?
     
    Hanadarko, Jun 18, 2012
    Hanadarko, Jun 18, 2012
    #3
  5. Jun 18, 2012 #4
    Autocar

    Autocar Road Train Member

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    The Hot Rod Shop Oxford, AL
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    Sounds like someone has played cut and splice with the harness.
     
    Autocar, Jun 18, 2012
    Autocar, Jun 18, 2012
    #4
  7. Jun 18, 2012 #5
    kwswan

    kwswan Road Train Member

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    My 95 kw had a push button switch in the overhead console labeled trl. hot line.
    It was factory. Never did
    find out what it was for
     
    kwswan, Jun 18, 2012
    kwswan, Jun 18, 2012
    #5
  8. Jun 18, 2012 #6
    RedForeman

    RedForeman Momentum Conservationist

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    This. Time to start looking for handiwork that doesn't look factory or the same age/condition as the stuff around it. Getting the right wiring diagram sections from your dealer will help locate and verify connectors and bulkheads that are likely suspects.

    I recently went through some tail light issues on our 04 FL Century. The First Big Clue was a nicely done extra ground wire on the rear of the frame that wasn't on the diagram. That led me to some suspicious looking tape here and there. I decided to replace the tail harness for a $50 part and a quick change instead of going fishing, since I needed the truck to go right back out. I couldn't help but do a post-mortem on the bad part. Underneath some neatly done cover up was a rats nest of crap from a previous owner that attempted to fix something somehow and just made a mess that was not going to last.
     
    RedForeman, Jun 18, 2012
    RedForeman, Jun 18, 2012
    #6
  9. Jun 18, 2012 #7
    rollin coal

    rollin coal Road Train Member

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    Nothing's much funner to fix than a hacked up wiring job.
     
    rollin coal, Jun 18, 2012
    rollin coal, Jun 18, 2012
    #7
    tjl9109 and Ruthless Thank this.
  10. Jun 19, 2012 #8
    Hanadarko

    Hanadarko Independent Owner/Operator

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    I got the KW schematics...but they didnt even show the bundle of fuses that feeds the trailer!
    Fortunately someone on here mentioned it to me or I might not have looked for it.

    So, from my perspective the KW printouts are useless. They show the hotline to be installed
    into SPARE 4 fuse and run off the BATT side of the feed. However, that spot only has power
    on ACC or IGN. Not like all the time.
    Everything works fine - I'm just stumped at what this hotline is.

    According to KW, when a hotline IS installed, you are to relabel the fuse panel.
    Mine is relabeled with a KW sticker (Same font as the rest of the panel) yet I cant find out what it does or where it
    might go. Pull the fuse, nothing changes. Add the fuse, nothing changes.

    I have found cut off wires that dont look factory like, but so far they too have led to no ideas.

    Weird.
     
    Hanadarko, Jun 19, 2012
    Hanadarko, Jun 19, 2012
    #8
  11. Jun 20, 2012 #9
    fishhook

    fishhook Light Load Member

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    Gas trailers need constant power to trailer when key is off to run scully systems, cannot load with out "hot line"
     
    fishhook, Jun 20, 2012
    fishhook, Jun 20, 2012
    #9
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