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Thread: Installed trailer harness... now no backup lights.

  1. #1
    prerunner1982's Avatar
    prerunner1982 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Installed trailer harness... now no backup lights.

    As the title says I installed a plug and play trailer harness and now I have no back up lights. Anyone else had this issue or have ideas?
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


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  2. #2
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    Default Re: Installed trailer harness... now no backup lights.

    Hmm, did you cause a short with some brittle wiring? Do they work when you unplug it again?

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    Default Re: Installed trailer harness... now no backup lights.

    They are switched on at the neutral safety switch. I would start there and see if that wire gets any juice
    230 hp 4.3L Chevy
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    prerunner1982's Avatar
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    Default Re: Installed trailer harness... now no backup lights.

    removing the trailer harness is a good start...and I thought of that, but it was a pain in the butt to pull everything out of the cargo area, remove the side panel and tail light to get to the plug to install it...but guess I will bite the bullet and possibly do that this weekend.

    Steve, would a manual trans have a NSS? If so, it's broken as I have used the starter to "drive" the Jeep off the road when the ignition coil gave out.
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


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    Default Re: Installed trailer harness... now no backup lights.

    yes, a manual trans has one. Not sure about the AX15, but most have one for neutral and one for reverse lights. Check side and by shifter
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  6. #6
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    Default Re: Installed trailer harness... now no backup lights.

    Check the fuse box under the dash...7.5 amp fuse marked TRANS.
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    #2. 1988 MJ Pioneer AW4-4.0L-NP231J-D30/D44 LSD - OPEN cooling - 3" lift - 31's

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  7. #7
    prerunner1982's Avatar
    prerunner1982 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Installed trailer harness... now no backup lights.

    Fuses all checked out good... removed trailer wiring harness.....still no reverse lights. Guess it's time to crawl underneath.
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


    Day of Dirt Adventure

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    Default Re: Installed trailer harness... now no backup lights.

    ouch. Sounds like something blew or fried when you hooked up the harness. Let us know if you find anything

  9. #9
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    Default Re: Installed trailer harness... now no backup lights.

    I would start by checking your bulbs and sockets. It's possible that when you plugged into the harness it cooked both bulbs. Unlikely, but possible. If the bulbs check okay, use a multimeter to confirm that the socket ground is still... well, grounded. Just check for continuity between the outer wall of the bulb socket and any chassis ground.

    Next, I would use your multimeter to check for voltage on the reverse light signal wire in the harness where you installed the trailer light plug. You'll have to turn the key on and place your AX15 in reverse to do this.

    Next, check your reverse light switch wiring. The switch is located on the passenger side of the AX15 near the back of the housing, it will be the only wires coming out of the tranny. Make sure the wires are in tact and that the connector is in good shape and not full of mud or corrosion. If all that checks out, disconnect the switch from the harness and pull it out of the trans. You can test it with a volt meter, just probe both pins and make sure there is continuity when you depress the ball bearing at the working end of the switch.

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