Trailer Reverse 12V signal - Ford Powerstroke Diesel Forum
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Old 08-19-2011, 07:06 AM
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Trailer Reverse 12V signal

I've never noticed or maybe I still don't know exactly how this works. Most of the time I'm hauling horse trailers, or any other trailer that has electric brakes.

I bought a boat with hydraulic trailer brakes and when you put it in reverse, as far as I can tell the 12v backup lamp signal goes to the solenoid and prevents the hydraulic brakes from locking up.
Well, I don't have that 12V on my trailer plug at my bumper. Am I right about how that works? Is that fused? What else should I look at?

2008 F-250 CC SB
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Old 08-19-2011, 07:46 AM
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I'm using the 7-pin connector. I've had my volt meter out and I checked voltage on all the pins. Everything works like it should, except the pin for the 12V reverse signal.
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Old 08-19-2011, 10:42 AM
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Found it. Fuse 63 in the engine compartment fuse box. 15a mini fuse.
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Old 08-19-2011, 02:19 PM
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Same thing happened to me...blown fuse for no apparent reason. Glad you found it.
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