jerrybb-
Ford or Workhorse chassis?
Do the turn signals and brake lights on the coach work correctly?
See this Web page for "7-Way RV Standard" 7-pin wiring.
According to the Winnebago wiring diagram (link
here; see Sheet 5 for Ford, Sheet 6 for Workhorse), there will be signals only on these pins on the hitch connector
Left turn/stop (9 o'clock pin)
Right turn/stop (3 o'clock pin)
Tail and running (a.k.a, Parking) light (11 o'clock pin)
Backup light (center pin)
when things are working normally There will be no signals on these hitch connector pins
Trailer electric brake controller (5 o'clock pin)
12V charge line (1 o'clock pin)
As your coach came from the factory, the wires to the coach lights and to the hitch connector are spliced together, so it would be difficult for lights to work on the coach but not on the connector. It is possible a prior owner has modified the wiring.
It could also be possible that the wiring inside the hitch connector has become disconnected or corroded such that it no longer passes signals. Since opening up the connector could create more problems, it would be wise to hold off doing so until you provide answers to the questions above.
All the wiring diagrams for your coach are available at
this link.