6 pin to 7 pin trailer adapter - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 06-26-2008, 07:31 PM Thread Starter
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6 pin to 7 pin trailer adapter

Well, I just picked my truck up from the dealer. Everytime I pull a trailer with brakes, it says trailer disconected on my dash. Now I have 3 Ford trucks. We have a 96 350 2wd dually, an 01 350 4wd flatbed dually, and an 08 250 FX4. The exact same trailers with the exact same adapter plugs work on the two F-350's, but not my 250. The service tech told me that I should rewire my trailers from 6pin connectors to 7 pin connectors that the Tow Command system is not designed for an adapter. Now, the lights work and if I pull the brake lever on the command unit, the trailer brakes will work; as it says trailer disconnected on the dash. Has anyone else had this problem? Does it make sense that this should be happening to anyone?

BTW, I have tried 2 different styles of adapter plugs. 1 from U-haul with their label on it and another from tractor supply that has lights on it showing power to everything.

2008 F250 FX4, 6.4ltr PSD, Torqshift, crew cab, short bed, leveled, 20x9 MB Motoring V-Drive's with 35" BFG All Terrain's.
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post #2 of 6 Old 06-26-2008, 07:53 PM
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Originally Posted by SHTUPNFISH View Post
Well, I just picked my truck up from the dealer. Everytime I pull a trailer with brakes, it says trailer disconected on my dash. Now I have 3 Ford trucks. We have a 96 350 2wd dually, an 01 350 4wd flatbed dually, and an 08 250 FX4. The exact same trailers with the exact same adapter plugs work on the two F-350's, but not my 250. The service tech told me that I should rewire my trailers from 6pin connectors to 7 pin connectors that the Tow Command system is not designed for an adapter. Now, the lights work and if I pull the brake lever on the command unit, the trailer brakes will work; as it says trailer disconnected on the dash. Has anyone else had this problem? Does it make sense that this should be happening to anyone?

BTW, I have tried 2 different styles of adapter plugs. 1 from U-haul with their label on it and another from tractor supply that has lights on it showing power to everything.
I haven't had the problem you describe, but I immediately rewired my trailer for the 7-pin RV type plug as soon as I got this truck. I figured I'd probably
never tow the trailer with another truck. It works flawlessly. Something I
really like about the '08 integrated controller is it actually modulates the
trailer brake pressure according to pedal pressure. The add-on controller
in my other truck didn't do that.

Russ Cook

2008 F250 FX4 SC LB 4wd
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post #3 of 6 Old 06-26-2008, 07:57 PM
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Just an idea for you. But you can wire a pigtail off the wiring harness. Then you have two plugs one 6 pin and one 7 pin. I did this with my trailer. I have it wired for my F-250 and I have the old standard 4 prong plug on it with no brakes. I have it wired like this because I loan out my trailer to my buddy who does not have a brake controller. All you need to do is wire in a 12inch pig tail off the wiring harness. Then you have the trailer wired up for all your trucks.


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post #4 of 6 Old 06-26-2008, 08:15 PM
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sounds like a controller fault the only difference is th 6 pin does not have a reverse light circuit but that should not affect the operation

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post #5 of 6 Old 06-29-2008, 09:04 AM Thread Starter
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Does anyone else use an adapter plug or am I the only one?

2008 F250 FX4, 6.4ltr PSD, Torqshift, crew cab, short bed, leveled, 20x9 MB Motoring V-Drive's with 35" BFG All Terrain's.
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post #6 of 6 Old 10-19-2009, 07:16 AM
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I am getting the deeping with the trailer disconnected on my dash on my 06, very very annoying. I hoped to find a solution here.


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