Trailer light conection malfunction - Ford Powerstroke Diesel Forum
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Old 06-11-2009, 09:45 PM
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Trailer light conection malfunction

I have a 2001 7.3 f250 crew cab. It has the factory trailer connections on back where it allows you to connect either the circle style trailer light connection or the flat 4 prong connection. When I check with a test light on either the 4 prong connection or the circle connection the right blinker does not get any power but my right tail light blinker works just fine. This is telling me it something specific with that line.

I know from tracing the wire back from the trailer light connections on the bumber that there is a short set of wires that go upwards that clip to a support close to the underside of the bed itself. When I test the wire that I think should be the right blinker that comes from the front of the truck before it hits the harness that powers the other side that goes to the connections on the bumber I do not get any power there either.

Can anyone tell me where that wire comes from? Meaning is it a single run separate from the run that supplies the regular right tail light blinker or does that line connect to it? I know an easy fix is simply tie the line going to the right blinker back into the right blinker wire on the trailer connections but I would like to avoid that if I can.

If the line is not a sinlge run from the front of the truck and does tap into that same line that runs the right tail light blinker than does anyone know where it splits or ties in? Just looking for the test points to see where I'm losing power.
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Old 06-11-2009, 11:05 PM
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After digging around on another forum I found the answer thay may or may not already be answered here. For that I will post what I found in case some of you ever get this problem. It appears the wires that run the lights on the truck i.e. tail lights, stop lights, parking lights etc. all have separate wiring from the front fuse box to the end of the truck then just branching off of those wires at the rear of the truck to run the trailer connections. I'm reserved as to if I like this design but it is what it is.

Turns out each is fused in this case from the fuse block under the hood in the engine compartment. 10A fuse small red one was blown. I changed it and used my test light to test the trailer connections in the rear and now I have power that blinks in sequence with the right turn signal. I also put the test light on each side of the fuse to test it there and it also blinked in sequence with the right turn signal.

The other post at the other forum confirmed this in other ford models.

After reading it I could not contain myself, I had to make a 2AM run to go get fuses and test this out for myself. I'm so glad i do not have to splice into the other wires to make my trailer connection work.
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