Help with P3 Brake Controller Wiring Please - Ford Powerstroke Diesel Forum
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Old 06-17-2013, 08:31 AM
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Help with P3 Brake Controller Wiring Please

So I just bought a Tekonsha Prodigy P3 brake controller from a other forum member. It also came with the 3035-P ford direct plug in harness.

My problem is this; When I plug in the controller, it powers up and goes straight to the "output shorted, no brake" screen. This is without a trailer connected. I am also hearing a rapid ticking noise thru 2 of my aftermarket speakers in the truck while the controller is plugged in.

Now, I researched online a bit and most people point toward moisture/other problems at the trailer connector or a short/problem with the blue trailer brake wire.

I tried using the universal harness that comes with the controller and got the same results, so that rules out the 3035-P harness being faulty. Next, under the direction of the Tekonsha tech rep, I hooked it up, powered up the unit and then cut the blue wire. The controller went back to the home screen, worked as normal and the ticking stopped. He was then convinced that I have a short in that blue wire somewhere in the truck.

Next, I tracked the wire from the plug under the dash and into its loom under the dash. All looked well. Then I went under the truck. Everywhere I could track that blue wire down, it looked fine. I went all the way to the trailer connector and cleaned it. From my other working F250 I even took the trailer connector and the wiring harness that plugs I to the truck's wiring harness. Swapping both out one at a time and leaving them unplugged entirely, yielded the same result.

I'm stumped here.
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Old 06-19-2013, 02:51 AM
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Don't everyone jump at once!


Turns out there was a short in the blue wire underneath the bed in a spot where I couldn't see it. $112 later at the Auto Electric shop, all is well.
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Old 06-21-2013, 04:11 AM
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I just saw the post and the problem resolution.

I was going to recommend you run a temporary replacement for the blue wire and see what happens. If it is proven to be the problem, I'd make the blue wire replacement permanent.

Congratulations on your successful fix!
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