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Hey Guys. I ran into this problem a couple of years ago with my trailer. I could not believe that Ford did not have the wires in their harness already so I did some checking. As an electrical contractor, I startyed tracing the wires up the frame towards the front drivers side, up the fender well to empty plug connectors at fuse panel. According to Ford Technical Service Publications(manual), Ford made(as an option) a trailer relay box which plugs in directly behind and attached the fusebox towards the firewall. The relay box plugs right into the existing harness without the running of new wiring. It will make one wire constant hot and one switched hot for your trailer brake battery charger. Or you can switch the wires to how ever you like at the trailer connnector. The Ford parts guy had no idea what I was talking about. If you need the part numbers, please reply back and I will have to try to find the invoice or check the unit for a part number. Hope I was not too late in my reply. Good Luck!
Andy
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2011 F350 CC Lariat 6.7 4x4 Tuxedo Black Loaded* ICON 4.5 inch Stage II with 4 link and Deaver Mini-Paks * OUO 5" Traction Blocks & Bars * 20" BMF Novakanes with 37x12.50x20 Nitto Trails * ICON Dual Steering Stabilizer * RECON Projectors, Mirror, 3rd brake, Cab,and Tailights * Pace Edwards Bedlocker * EPIC Door Seal Mods * AMP Research Steps * http://community.webshots.com/user/ammayernick
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