Jim18655-
Both the operator's manual (link
here, page 6-11) and Auto Lamps Wiring Diagram (link
here, sheet 3) for your coach say that it came from the factory with a 6-pin connector, wired for these five signals:
Ground
Left turn-stop
Right turn-stop
Parking lights
Backup lights
The sixth pin had nothing wired to it.
Ford did not wire a 12V charge line on the F-53 chassis. They left that up to the coach builder- in this case, Winnebago. And, in this case, it appears Winnebago did not supply a charge line, either. If your coach has one, it likely was added after the coach left the factory.