My ford did this, a fuse was blown. Check the war wagons manual and inspect any fuse that looks like it is related to towing. My issue was identical to yours. I had a fuse panel under the hood, and dash. Took pulling about 5 before I found it.
I was just about to start tracing and testing wires.
Results 1 to 10 of 46
Thread: Trailer Woes, Tow Vehicle maybe?
04-06-2012, 12:27 AM #1506 Supra 24 Gravity Games