We have a 2003 f250 super duty. We have no power at turn and brake light pins at 4-pin connection on truck when hooking up to our boat trailer. Where is the relay for the trailer tow turn stop located on truck? We hooked the boat up to another truck and everything works on the trailer so we know the problem has to be on the Ford.
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.
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