Ford fro some reason does not keep the 12V wire hot with the ignition off. I had to supply a hot lead for this.
If the truck is on and you do not have power check the fues box under the hood.
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1996 F-250 extended cab long box five speed. Home made Tymar, 203 Stat, 60 gal in bed fuel cell, 315/75's, no muffler, ebpv welded open 3" to 3" DP, Babies. 290K, still chugging, and still smoking when cold.
UPDATED 8/1/08 Replace so far. 1 LUK flywheel+clutch, 2 thermostats, 2 set of brakes, 1 set of calipers, 5 CPS, 3 sets of tires, 2 Transfer pumps, 1 Injector modual, 1 Computer, 2 Alt, 2 sets of batteries, 1 Water pump, 6 Belts, 1 PS hose, 2 Sets ball joints, 2 set u-joints, 2 carrier bearing, 2 Speed sensors, 1 oil pres sender, 1 temp sender, 4 sets of e-break cables, 1 front fuel tank, 2 rear fuel tanks, 2 set of glow plugs, 6 Glow plug relays, Oil galley o-rings, Turbo pedistal o-rings, EBPV o-rings, 3 sets of Injector O-rings, 1 Vac-pump, 1 new carpet.Total $$$ in repairs v/s miles driven = 3.0 cents per mile. Add fuel to that it jumps to 14.8 cents per mile over the life of the truck.
You will either have to run another wire that you can hook up constant hot (don't forget to install an in line fuse) or you can put a battery on the trailer to run the lights. This way you can have lights inside wheather it's hooked to the truck or not. If you install a battery you can hook up the switched hot wire in the plug to it to help keep it charged while you are driving.
Joe
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2002 F350, Crew Cab, 4WD, ISSOPRO Gauges,
3.73, Auto, 2wd low range mod, No door dinger,
Interior lights off switch, Zoodad Mod,
Extra Trans Cooler, Before coolers trans fltr,
Coolant fltr, Crimestopper remote start/alarm
Oil Guard Bypass, Air horns
I have a Pace enclosed car hauler and my 12V interior lights only work when the lights are turned on in the truck. It took me a bit to figure it out, but it doesn't matter if the truck was on or off. I don't like turning the truck lights on to use the 12V interior trailer lights so I may try the above battery idea.
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Ed
04' F250 C/C, SWB, 6.0L, 4x4, True Blue/Silver
ISSPRO Gauges, Firestone Air Bags, LEER Cap, Super Liner Spray In
I love my truck.
I have a Pace enclosed car hauler and my 12V interior lights only work when the lights are turned on in the truck. It took me a bit to figure it out, but it doesn't matter if the truck was on or off. I don't like turning the truck lights on to use the 12V interior trailer lights so I may try the above battery idea.
That doesn't sound right. I have a friend with a Pace and his works as described above. You might want to verify there isn't a wire crossed or something in the plug. Are you close enough to have the dealer check it?
Tom
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02 CC XLT Dually 4x2, PSD w/6 spd, White w/Med Flint 40/20/40, TTT Mirrors, 4.10 L/S, PCM=AEB4, Receiver, Cab Steps, Homelink X Visor, Husky F&R Mud Flaps, AIS Ford Filter, WD Pyro & Boost in A-pillar, Line-X, Hutch Tank Mod, Pre-Pump Racor 645R30, 4" Banks Monster Exhaust, Mag-Hytec Diff Cover, Amsoil in Tranny & Diff.
Bye-bye 99 diesel-sucking automatic!!!
If you have a small breakaway battery, replace it with a larger one, then hook your lighting up to it . The battery should charge again when hooked up and traveling.
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99.5 F350 XLT Lariat 4X4 AT 4.10 DW CC LB Centurion conversion Garret Turbo Radio SD & Tape 126,700 03/08 Build date 03/99
Rebuilding engine. 92 F350 7.3 IDI CC LB dually Banks turbo US Gear O/U ENGINE IS SHOT !
1990 F350 XLT Lariat 7.3L IDI E4OD Dually 280K+ 2WD
Reman Promar Long Block 11/07
Reman IP - New Delphi Injectors Beru GP's New radiator & hoses New WP
Dual Exhaust 3"X18" resonators
Soup bowl gone, 4" intake W/AZ filter
Cobra CB W/Weather Interrupt - Dual Trucker Antenna's
Blk. Grill W/Brush Guards - Fog lights - Rally driving Lights. GN 20K & Reese 16K 5er hitch
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 4X45 Speed Manual * 210,000 miles original owner* Banks Power Pack * DP Tuner F5 Chip * 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 * Amsoil Bypass Filter * AFE/Tymar * Viair Onboard * Mag-Hytec Diff Cover * Amsoil Everywhere * LT315/70R17/D on M/T Classic Locks * PULSE HPOP and CPR Fuel System* http://community.webshots.com/user/ammayernick
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Phantom II Pyrometer Fuel and Boost Gauges * Customized Dual 4" Diamond Eye SS Exhaust w/offroad pipe * Dieselsite Turbo Saver * Amsoil Bypass Filter * AFE/Tymar * Viair Onboard * Mag-Hytec Diff Cover * Amsoil Everywhere * LT315/70R17/D on M/T Classic Locks * PULSE HPOP and CPR Fuel System* 
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