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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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1997 F350 7.3 PSD Black Crew Cab XLT 4X4  5 Speed Manual * 229,000 miles original owner* Banks Intercooler * TW Tunes * Centerforce Dual Friction w/SMF * Baby Swamps  Phantom II Pyrometer Fuel and Boost Gauges * Customized Dual 4" Diamond Eye SS Exhaust w/offroad pipe * Dieselsite Turbo Saver * 2001 IDM * Amsoil Bypass Filter * AFE/Tymar * Viair Onboard * Mag-Hytec Diff Cover * Amsoil Everywhere * LT315/70R17/D on M/T Classic Locks * Dieselsite OVERDRIVE, Adrenaline HPOP and CPR Fuel System* Beans D66 & Modded Pedestal * Super-Duty Spring Upgrades w/RSK & ICON Rears *
http://community.webshots.com/user/ammayernick
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