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Assuming you are sporting the steadfast always ready for another chore 7.3l diesel. This should be of help. Good luck. Well I seem to be having trouble posting files from my IPhone. I'll fix the iPhone issue and post the diagrams in a few minutes.
There is a high curent box under the hood and another one in the cab. Drivers side behind panel by left knee.
However, I don't think the block heater has a fuse; it's wired direct to the plug that goes into the wall socket. It may have an internal fuse in teh block heater itself.
Check fuse #6 20amp on your interior fuse panel it may be blown. The relays are located in an auxillary relay box located under the hood on the drivers side fender near the firewall. The system uses 2 relays. One relay turns on for left turn signal, other relay turns on for right signal. Both relays turn on for brake lamps. The fuse #6 is more likely the problem. If the fuse is blown, replace it, wiggle the wiring on the trailer while someone steps on brakes to check for shorts.
first thing i would check is the wiring were the plow wiring is spliced in at this is most likly the culprate. or you may have a bad multi function switch in the steering column
No trailer running lights 2003 F250 diesel
Under hood fuse box
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