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Factory Trailer Harness Problem. Help me please

Discussion in '1st Gen. Tacomas (1995-2004)' started by snoozeworm, Feb 8, 2011.

  1. Feb 8, 2011 at 10:08 AM
    #1
    snoozeworm

    snoozeworm [OP] taco king

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    I have the factory harness on my 04 tacoma, i have only used it 5 or 6 times, and now when i go to plug my trailer in the brake lights dont work and only the right blinker will work. Also, when the 4 way flashers are on, still only the right tail light blinks.

    I drove my truck to Lowes and plugged in a new trailer and it has the same problem, so it is something in the truck. What could be the problem?
     
  2. Feb 8, 2011 at 10:13 AM
    #2
    vantaco

    vantaco Well-Known Member

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    check all the connections for the harness
     
  3. Feb 8, 2011 at 10:15 AM
    #3
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Get a test light and start tracing your problem backward from the wiring harness until you find the disconnect. Start with the simple stuff, make sure all connections are plugged in and snug. Once you've eliminated the connections as the culprit, start tracing the problem with a test light.
     
  4. Feb 8, 2011 at 10:28 AM
    #4
    snoozeworm

    snoozeworm [OP] taco king

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    do you think it could need a new tail light converter?
     
  5. Feb 8, 2011 at 10:37 AM
    #5
    tacomaforlife

    tacomaforlife Well-Known Member

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    could be a bad wiring harness mine was bad ive replaced it with a new one and everything works great now.
     
  6. Feb 8, 2011 at 12:51 PM
    #6
    twfsa

    twfsa Well-Known Member

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    On mine I had a seperate fuse that was blown, that was not in the normal fuse panel it was in the access part of the cab located in a storage compartment, behind the drivers seat.
     
  7. Feb 9, 2011 at 3:46 AM
    #7
    snoozeworm

    snoozeworm [OP] taco king

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    that is strange, i have never heard of a fuse panel back there. I have a single cab though..
     
  8. Feb 9, 2011 at 5:04 AM
    #8
    Simon's Mom

    Simon's Mom Wag More Bark Less

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    The same thing happened to me.
    I had to swap out my converter that plugs into the tail light.
    I checked the ground first on the converter, then reset all my connections (unplugged, dielectic greased the fittings etc & fuses.
    Finally tried another trailer & had the same result.
    Swapped out the converter box with a new one, worked like a charm.
    G/L
     
  9. Feb 9, 2011 at 11:17 AM
    #9
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    Happened to me as well. Still haven't replaced mine yet. It's on my list of things to do before summer.
     
  10. Feb 10, 2011 at 6:27 AM
    #10
    snoozeworm

    snoozeworm [OP] taco king

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    was it an easy swap. Like, did you just buy a converter, cut the old one out and splice in the new converter. or was there more to it?
     
  11. Feb 10, 2011 at 8:35 AM
    #11
    Simon's Mom

    Simon's Mom Wag More Bark Less

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    yes I just bought the converter from Amazon. You can get them at Autoparts stores, etrailer much cheaper than dealer. I learned that on here.
    It plugs rights into the tail light harness so take out tail lights, unplug old converter, plug in new one. You do have to thread the wires for the flat plug to come out by the receiver. I used the plastic wire loom & zip ties to keep it clean & up out of the way. It was not that hard at all.
    There is a newer one (toyota part) that goes all the way up to the front of the motor but I just use the cheaper model for all our trailers are 4 wire.
    There was a youtube video for it lol...
     
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