Originally Posted by f1100turbo
Above statement correct.
Ford uses a relay.
Gm uses a fuse.
If the tow charge wire was never energized via a fuse or relay it still isn't.
Sabre owners united!
Nice diagram Turbs but, if your sitting on the ground with a test light or volt meter probing under your flip up weather cover, refer to the 7-way Trailer side diagram. The diagrams depict the "back side" of the respective connectors where the respective wires would be attached.
So, the "pin" near the "1 o'clock" position should be "hot" with the ignition in the "on" position.
I had a 2002 Chevy and if I remember correctly, flip over the cover of the under hood electrical center, and the location and purpose of each fuse/relay is indicated. In my case I believe it was labeled AUX 1 and AUX 2 and they were 30a MAXI fuses. In later years, not sure exactly which year, they went back to the regular type mini fuse.
But anyway, with all of our fellow campers' input you should be able to figure it out from here.