need help with trailer plug wiring
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Senior User
Joined: Feb 2007
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From: Maple Ridge, Canada
need help with trailer plug wiring
I just bought a trailer a few months ago. I towed it home and all the lights worked. I wired a brake controller in, and now the running lights on hte trailer are not working. The brake lights are working. I checked the fuse (#4 in the engine compartment) and its good. I check the voltage at the pins on the truck and I have no voltage from + to -, no voltage aux to -, no voltage on running lights pin, but do have 12 volts on the brake pin. What else can i check?
I also diconnected the brake controller and it did not change
I also diconnected the brake controller and it did not change
Thread Starter
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Senior User
Joined: Feb 2007
Posts: 180
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From: Maple Ridge, Canada
Scanning it would be difficult, I don't have have one available. But there were only 4 wires. One directly to pos (through a breaker), another to neg, one to a wire from the brake pedal(under dash), and another to the trailer plug (blue wire, trailer plug).
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Senior User
Joined: Feb 2007
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From: Maple Ridge, Canada
yeah # 4 is good. this is frustrating, I wanted to leave to go camping with the family tonight. its a no go if i can't figure this out. If I'm getting 12v on the brake wire, the ground should be fine. the signals work too. what is the pos terminal for? it doesn't have voltage nor backup lights, nor running lights. thats the top 2 pins and center, on the plug.
Senior User
Joined: Apr 2009
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From: Texas
Don't know if this will help you but, I went to uhaul, bought a "plug in splice" 7 wire combo w 4 wire plug took 5 minutes to install no mistakes possible. It just plugs in directly to your existing ford wiring harness in between the tail lights. Think it was like $29. Quik ezy -go CAMPING!!!!!
Fifthwheel01
Fifthwheel01
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Joined: Apr 2009
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From: Texas
Forgot to ask- what kind of controller did you get and did you get the direct plug in adapter for your truck that plugs in right under the dash.
Fifthwheel01
Fifthwheel01
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From: Texas
Also you can go to e-trailer.com and get lots of info and wiring diagrams/schematics and more if your have a camper you'll bookmark this one.
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Thread Starter
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Senior User
Joined: Feb 2007
Posts: 180
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From: Maple Ridge, Canada
I'll check those sites, thanks. I've checked every fuse related to towing and/or lights. they are all good. I've found a diagram with a "trailer running lights" relay. I think it is in the relay block behind the stereo. I don't know which of the four it is, and ford wants the part # to order it. jeeesssshhhhh! I just want to get going! 
the controller is older drawtite. no adapter, i wired it straight in.
the controller is older drawtite. no adapter, i wired it straight in.
Thread Starter
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Senior User
Joined: Feb 2007
Posts: 180
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From: Maple Ridge, Canada
Did it happen after you installed a brake controller? I'm trying to narrow down the variables. I have no idea if its something I did or and exisitng problem with the truck because this is the first thing I've towed.
BTW, went camping with the trailer anyway
Just drove during the day. I was awsome! family loved it! truck towed well. Just wondering how a stock truck should pull up a 7% grade. I have a 24ft trailer and I could only go 70 to 80 kmh (45 to 50 mph, eh!). Rpm about 2600, i didn't want to push 3000 up a long hill. I was passed by a toyota towing the same size rig! I was shocked.
