hey guys, i was having factory trailer wiring problems, due to corrosion. and if anyone needs to rewire the factory 7 way round plug back in then this info is for you!!

CAV CIRCUIT FUNCTION
1 - -
2 Y140 18WT/PK TRAILERTOW RIGHT TURN RELAY OUTPUT
3 L1 18VT/BK BACKUP LAMP FEED
4 Y133 14WT/RD FUSED B(+)
5 L76 18BK/OR PARK LAMP RELAY OUTPUT
6 - -
7 B40 14LB TRAILER TOW BRAKE B(+)
8 Z52 14BK GROUND
9 Z52 14BK GROUND
10 Y141 18YL/PK TRAILER TOW LEFT TURN RELAY OUTPUT

that is all the wires and where they go. in '00-'01 the colors changed a bit, but all you need is a circuit tester to figure out what wires are what on the truck side of the harness. ie: l+r turn signals, brake signal, parking lamp signal, and reverse lamp signal. enjoy.

hopefully this gets put into the faq section!