Trailer Electrical Problems need help - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 03-01-2012, 10:56 AM Thread Starter
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Trailer Electrical Problems need help

1995 F-250 Powerstroke, I dont have power at the back of the truck for running lights on trailer. Truck running lights work fine, I do not have power at the brown W/white wire. I tested connectors above the bumper where the trailer pigtail plugs into factory harness and there is no power there either. I do not have a wire diagram of the underhood relays and which one controls the trailer lights. I have tested all fuses and they are all good with continuity across them.
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post #2 of 5 Old 03-01-2012, 12:41 PM
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IIRC I think the trailer relay is #3. If I get a chance, I will take a look at my EVTM tonight. Cheers!

1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.
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post #3 of 5 Old 03-01-2012, 03:41 PM Thread Starter
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I would greatly appreciate it.
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post #4 of 5 Old 03-01-2012, 06:52 PM
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Power for the Trailer Marker Lamps comes from Underhood Fuse 4, through Underhood Relay 4 (second closest to the engine ... the closest relay spot, #5, to the engine is not used). The relay is switched by power from the main light switch (when the light switch is in headlight or park light mode). The Brown/White trace wire comes right off the relay and goes through a couple of connectors in the engine compartment. Cheers!

1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.
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post #5 of 5 Old 03-02-2012, 12:35 PM Thread Starter
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Thank you, I will have to track it down. I can hear the #4 relay click when I turn the light switch on so i will have to start there and see where the break is. Thanks for the info I appreciate it.
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