Faulty brake controller on my truck?

Discussion in 'Tack & Equipment' started by Allkian, Jun 8, 2018.

  1. Allkian

    Allkian Senior Member

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    I realize this is a bit off topic but I'm needing some experienced advice. I recently bought a brand new horse trailer. I also recently had my 7-pin flat plug on my truck rewired. Hooray! Everything on the trailer works EXCEPT the brakes. I'm thinking it might be the brake controller. I drive a '97 Chevy diesel and it had a controller installed so I'm not sure of its history; it is aftermarket. There is power to it, but my trailer brakes don't engage and I can't use the manual slide to engage the brakes.

    I am skeptical to just take it to anyone, since I've had a lot of folks try to take advantage of me because I'm a young girl driving this old rust bucket truck. Soooo I want to have a pretty good idea of what I might need to do, before I take it to anyone. I am new to the area and don't know who's reputable or not.

    Has anyone ever changed out a break controller? I took a look at it and it appears to be hardwire (i.e. no pigtail) so its not exactly plug and play. Would I be able to just cut the wires at the old controller, remove, and then solder to the wires of a new controller?

    TIA!
     
  2. PyroTekNik333

    PyroTekNik333 Senior Member

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    If there is power at the plug on the truck the problem is at the trailer end.
     
  3. Cynical25

    Cynical25 Senior Member

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    My gas Ford needed a $12 Relay added to the fuse box to get my trailer brakes communicating with my truck brake controller. I know nothing about diesels or Chevys, but perhaps that's a starting point for you.
     
  4. paval

    paval Senior Member

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    Find someone who knows how to use a circuit tester.

    Typically the wire for brakes on tow vehicle and trailer is blue, but not always.

    Maybe call some RV dealerships and see if their shop will troubleshoot.

    Since I don't think we're supposed to link to outside websites, I PM'd you a link to a page that tells you how to troubleshoot when brake controller has power but trailer brakes aren't working.
     
    Last edited: Jun 8, 2018
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  5. manesntails

    manesntails Senior Member

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    More likely they rewired the pin wrong.
     
  6. kb1gra

    kb1gra Senior Member

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    Guessing you do not have power to the pin that makes the brake connection.

    Also if your controller is not new, upgrade it to a proportional controller like a prodigy p2 or p3. Your horses will thank you when they are not getting jerked around by an old time delay controller.
     
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  7. JStorry

    JStorry Senior Member

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    Does your brake controller light up? If so it has power.

    There is a 7 wire plug tester available. Really simple, it has a little light indication for all 7 pins. Plug in and they light up. If you want to be sure pick one of those up (my local truck shop sells then m for like 20$) then you have an idea if you have power to the plug. If all that works it's a trailer problem.

    Another easy way to check is to hook up to another trailer if you can and see if everything works on the truck end.

    Eta - replacing a brake controller is simple, but it would not be he first place I checked.
     
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  8. Shmee

    Shmee Senior Member

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    In terms of finding a mechanic, you might want to check the Mechanix Files on the CarTalk website. That’s where I look every time I move to a new city.
     
  9. manesntails

    manesntails Senior Member

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    Get them to check out how the pin is wired first. Years ago the guy put a wire wrong on mine and I had no lights on one side. It matters which wire goes to what position.
     

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