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I need a wiring diagram for a 2003 F250 for a 7 pin trailer hookup.

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Here ya go :-)
http://www.farmbox.com/shop/59

Posted on Jul 08, 2010

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You'll need to disconnect the wires from either the truck connector or the trailer connector...
I highly suggest purchasing a voltage checker- it looks like a screwdriver with a pigtail of wire with an alligator clip on the end. The tip of the 'screwdriver' has a point for probing. The light in the probe will light up...makes it easy to trouble shoot without a helper behind the trailer.
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If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.

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Hi there;

Here is the wiring diagram for the trailer wiring for your truck.
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Hope this helps
Farrout!

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