I have just bought my second SD for my business, a F450 with a flatbed. My first is a 2000 F250 with the factory tow wiring. My questions concern what factory harnesses are there in my truck. There is no hitch as of yet on the truck. I know I can use a T-connector for lights. I have also located the factory plug under the dash, identified by the correct wire colors and plug shape. My main question: where can I find the other end of the plug or is there one. I do not have the small power relay box as my 2000 has, but if I can find the correct plug ends, I can fix that by wiring in a fuse to the battery and hopefully ordering a factory harness to the rear. Thanks in advance.

 

The wiring for the plug under the dash for the brake controller goes to the under-hood fuse box where there are locations for fuses and relays for the trailer lights, battery charge wire, and brake controller. If you have the towing package, the wiring will be connected to the other side of those fuse/relay locations and already be run down the frame. If you don't have the towing package, your wiring ends at that fuse box and if you want the factory setup you have to connect it up from that box. It's probably easier in that case to just use the T-connector for the lights and run your own wiring for the battery charge (if needed) and the brake control. I inquired about buying this factory towing harness from the Ford dealer and they said no such thing was available through thier parts department. I went the T-connector route. Maybe you will have better luck with your Ford dealer...