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Old 08-01-2013, 10:38 AM
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Trailer Brake Issue

When I plug in my trailer plug the factory trailer brake s show that I have brakes, but when I apply the brake pedal the trailer brakes do not work. However when I pull the little slider switch thingy on the factory brake controller the brakes on the trailer do work.

Any idea why my trailers brakes don't work when I press the trucks brake pedal? Thanks for the help!

-Mike

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Old 08-01-2013, 12:26 PM
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They don't seem to be working at all or don't work very well?

What's you gain set at?

Most any mechanic has a tester they can plug into the connection at the hitch of your truck and then they can step on the brake and check to see if your getting the correct voltage. Doesn't take 2 minutes. My mechanic did it for free.


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Old 08-01-2013, 12:53 PM
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My gain is set at 10. The brakes on the trailer do not work at all with the pedal, but will with the slider on the factory controller.

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Old 08-05-2013, 08:20 AM
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Here is an update on my problem. I pulled my trailer 300+ miles this weekend and used the manual slider when I needed brakes. Yesterday on the way home the dash kept beeping and saying the trailer was disconnected and the screen on the brake controller kept flashing. After about and hour of that I had no trailer brakes at all and the controller never registered that the trailer was plugged in(the trailer lights still worked though). Any thoughts?

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Old 08-05-2013, 04:05 PM
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Well that sounds similar to an issue I had a while back. With my trailer connected my dash would tell me the trailer was disconnected. Everything worked but it continually tell me the trailer was disconnected.

Long story short it was a loose connection between the trailer plug and the truck receiver. I just had to really shove the connection together and carefully clean some very very light corrosion from both parts.

You can do some trial and error to narrow down the issue or take it somewhere and have it tested.


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Old 08-05-2013, 04:12 PM
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Ive got a older TEKONSHA brake control that I pulled out of my 2005 f350 that I could send you if you wanna hook it up and see if it makes some kinda change for the better. It worked great for me but I got a smoking deal on a newer set up so I changed it out.
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Old 08-05-2013, 05:36 PM
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Kinnisoj, let me see what I can figured out with my connections first, and if that doesngt work, I may take you up on your offer.

44mag, I will give it a try and see what I can figure out.
Thank you both!

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Old 08-15-2013, 07:02 AM
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I have the same thing happen intermittently. Almost everytime, I go back and give the plug just a bit more of a shove and it's fine after that. It could also be the back side, it's actually a 2 piece unit. The part you plug the male end into connects behind the metal plate to another. That could possibly be not fully connecting or pulling loose when you disconnect the trailer plug.


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Old 08-16-2013, 06:37 AM
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I will give the plug on the hitch a try. I can't believe I never thought of that. I replaced that part about three weeks ago too. Thanks!



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Old 08-16-2013, 03:42 PM
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I doubt it's in the bumper area wiring. Otherwise, manually operating the brake wouldn't do anything either. In an after-market controller, there is a wire that taps into the brake lights at the pedal to detect when you've pressed the brakes. Triggering the relay to power the trailer brakes. I'd imagine that the factory controller uses a similar technique, but in a harness some where. To me, it seems like the controller doesn't know you've hit the brakes.

Not sure on your year, but looking at the 2008 F250 wiring diagrams and fuse boxes, here's my best guess...
There's a yellow w/ green stripe wire coming off of stop light relay post 5. This feeds the 3rd brake light and the BOO (brake on/off) relay to the brake controller. If your third brake light works, you know the relay is good. There is a BOO relay feed fuse (#12 - 15A) that could be popped and causing this issue.
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