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It sounds like your previous owner messed up the truck's wiring good and proper.
The 2004 came std with the trailer tow pkg, including a 7-wire and a 4-wire plug at the rear bumper. But not including the receiver hitch, which was optional. So all you should have to do is plug in the brake controller under the dash, and plug in the 7-wire trailer plug at the back bumper. If you trailer has a 6-wire plug instead of a 7-wire plug, you can buy a converter at any RV or trailer supply store.
If the PO screwed up the stock trailer plugs and the wiring harness to those plugs, then you're on your own to reverse whatever he did. But all the wires needed, and in the right size, should already be there somewhere near the back bumper. I don't do automotive wiring, so I would take it to my RV store and have them restore the trailer towing plugs to standard configuration of 7-wire and 4-wire plugs at the back bumper.
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My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it last year. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat.
Last edited by SmokeyWren; 07-08-2009 at 06:46 PM.
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