Trailer wiring tester...

Discussion in 'Tow Rigs and Trailers' started by braxton357, Mar 8, 2020.

  1. braxton357

    braxton357 Robot

    Apr 6, 2005
    I don't know if this is something anyone else cares about but it's something that's bothered me for a long time since I'm a trailer hoarder and most of them are shitty. Anyways I've got a couple of the cheap china 7 pin vehicle side light/brake testers that work pretty well for checking the truck side, but there isn't really anything out there decent for checking the trailer wiring...the wiring that's usually the issue. So anyway it's not pretty but it was an hour worth work and all stuff that was laying around -- even if purchased is less than $50 worth of stuff.
    12v battery, cheapo 4 relay 12v remote, and a 7 pin vehicle side connector. (also a flat 4 pin if you want). I added a fuse and on/off switch and set the relay block up to be latching on/off, just stand at the back of the trailer and push the button... 20200308_165131.jpg

    Attached Files:

    yager, Caver Dave, 89wrangler and 4 others like this.
  2. Bebop

    Bebop Active Member

    Nov 16, 2019
    Nice !

    I use a stick to press the brake pedal and the warning button for the blinkers, but that's awesome !
    Jody Treadway likes this.
  3. Stuntman Autoworks

    Stuntman Autoworks Instigator of things

    May 6, 2010
    Sanford NC 27330
    I had a box at camping world we made with toggle switches to turn circuits on when testing the trailer and an old magnet and lights to test the truck plug and brake controller.
    Yours is pretty slick with the remote control.
  4. jeepinmatt

    jeepinmatt Still Fat

    Mar 24, 2005
    Stanley, NC
    When I unlock the doors on my truck, all the running lights, tail lights, and tag light come on. When I lock it, it cycles the brake/turn lights. And the fob is wireless :D
    Stuntman Autoworks likes this.
  5. skyhighZJ

    skyhighZJ Thanks for your taxes

    May 31, 2012
    Aberdeen, NC.
    That’s interesting. My lock/unlock only cycles the vehicle lights (2012 Cummings) not anything connected through the 7 pin. Maybe it isolates the trailer lights to only function during normal operation?
  6. shawn

    shawn running dog lackey of the oppressor class Administrator

    Mar 13, 2005
    Raleigh, NC
    ... unless a wire on the trailer is shorted to ground.
  7. Fabrik8

    Fabrik8 Overcomplicator

    May 27, 2015
  8. ghost

    ghost Well-Known Member

    May 25, 2006
    I need something like that. I usually grab the wife or one of the boys......

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