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Old 12-24-2012, 09:43 PM   #1
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Harnessed with problems

I got distracted the last time we took our fifth wheel out, and I ended up breaking the plug for the wiring harness in my truck.

Yesterday I finally got around to replacing it. However, I didn't notice until I got the last wire undone from the old 7-pin plug that the wires weren't the same color as what was written on the plug.

I've spent the last two days trying to figure out which wire goes where.

The 7-pin has spots for Black Blue Red Brown Green and White.

The wires coming out from under the truck are Black, Blue, Red, Brown, Green, and YELLOW.

I tracked the wires down to the bumper plug on my 2004 F250, and then back up to where it plugs into the harness.

I still can't make much sense of what I've got, since the colors under the truck don't make much sense, either.
Blue connects to Blue, and
Green connects to Green
Black connects to White
Brown connects to Black.
Red connects to ... Orange?
Yellow connects to ... Yellow?

If I connect everything sorta like the above (there is no orange or yellow on the 7-pin), I can get the brake controller to show that it is connected, and it will give me a reading if I push on the brake.

However, the brake controller will do the same if I connect Blue to blue and Black to black. Or Blue to white and Black to Blue.

Yesterday, I while poking around on the various options, I did manage to let loose a few sparks. I've checked all of my breakers and fuses INSIDE the trailer.

Since nothing lights up, no matter how I connect things (other than the brake controller) I'm wondering if there might be another fuse in the RV that I'm missing.

Failing that, does anyone out there know how the 7-pin should be connected to an F250 when the standard color code doesn't work?

Thanks for any help you can through my way!
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Old 12-24-2012, 10:04 PM   #2
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Hope this helps. Merry Christmas
this if from a Ford forum
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Old 12-24-2012, 10:52 PM   #3
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It shows great promise. Thank you.

Any chance there might be a hidden breaker or fuse I've blown?
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Old 12-24-2012, 10:58 PM   #4
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Maybe blew a fuse in the truck. Controler and Hot from battery could have resteable fuses under hood. You really need a 12v test light then you can tell for sure. testing one pin at a time
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Old 12-24-2012, 11:24 PM   #5
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Ah!

I thought since the truck's lights were working there wouldn't be a fuse problelm in the truck.

Makes perfect sense.
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Old 12-24-2012, 11:31 PM   #6
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Originally Posted by Wandering Man View Post
Ah!

I thought since the truck's lights were working there wouldn't be a fuse problelm in the truck.

Makes perfect sense.
Yes on some newer model trucks there are towed unit fuses .
That way if there's a short in the camper the truck lights all still work.

Turbs
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Old 12-24-2012, 11:52 PM   #7
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Yes I know from many, many times of having to fix this, fords have trailer only fuses that blow quite regularly. They are in the under hood fusebox on the drivers side. You will have to look in the owners manual for the fuse description and then match it to the fuse layout diagram on the inside of the fuse box lid. If I was standing there I could probably point it right out, but kinda hard not being there.
Best of luck!
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Old 12-24-2012, 11:56 PM   #8
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Oh yeah. The colors on the plugs never match the wires correctly like you stated. I have a card in my truck that I had the cross over wrote on it, but it looks like someone already has one listed.
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Old 12-25-2012, 12:21 AM   #9
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Here is what has worked for me on Hoppy replacement plugs


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Old 12-25-2012, 08:22 AM   #10
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Yes I know from many, many times of having to fix this, fords have trailer only fuses that blow quite regularly. They are in the under hood fusebox on the drivers side. You will have to look in the owners manual for the fuse description and then match it to the fuse layout diagram on the inside of the fuse box lid. If I was standing there I could probably point it right out, but kinda hard not being there.
Best of luck!
You're only a state away. Come on down, and point, and I'll buy you a beer.

I'm about 7 hours south of Dallas.

Running down to help me is probably not the way your family would like you to spend Christmas. So instead, stay home and have a great day.

Thanks to all who have gone before me and figured out the correct way to hook up a 7-pin.

Have a Merry Christmas. Mine is going to be much better, thanks to you.
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