Thanks for all the replies. Went back to the storage shed resolved to straighten out the mess. Turns out that either Workhorse or Monaco added a 6 pin flat connector that fed directly to the trailer connector. Probably originally a 6 pin trailer connector at the hitch. Over time it was changed to a std 7 pin and jury rigged wiring. So although the flat pins in the diagram that was sent to me by Mark was interesting, it did not show the trailer flat pin connection. Anyway, after much testing/running back and front!, this is what I found - hopefully helpful to someone.
Flat 6-pin is labeled A-F.
Pin A - GRND. White wire
Pin B - AP (12v accessory Power). Black wire (incoming wire is not there so no 12v available at this pin) not sure if it was ever there (clipped right at the incoming connector) but I couldn't find a wire in the incoming flex tubing that might be the missing wire. Since there is no wiring diagram, I can't be sure if there ever was suppose to be one there.
Pin C - LT (Left Turn). Red wire (not used - cut off in outgoing flex tubing). The LT/Stop wire is provided by a yellow wire from 4 to 2 wire converter
Pin D - RT (Right Turn). Brown wire (not used - cut off in outgoing flex tubing) The RT/Stop wire is provided by a brown wire from 4 to 2 wire converter
Pin E - Rev (Reverse). Yellow wire
Pin F - Tail (parking lights/headlights). Brown wire
Of these 6 pins, only three are in active use going to the 7 pin trailer connection: (Pin A, Grnd; Pin E, Rev; and Pin F, Tail). Pin B is connected (AP, 12v) but since there is no incoming wire to the six pin connector, it doesn’t do anything.
As stated above, not sure who provided the 6 pin flat connector (Workhorse or Monaco, or ?) but neither appears to provide any wiring diagram for this setup.
Thanks again for the assistance and hope this helps someone in the future.
2004 Holiday Rambler Vacationer 36WDD (Workhorse Chassis)
2004 Honda Goldwing w/trike kit
1995 27' Fleetwood Flair (Sold)
US Navy - Vietnam Swiftboat Vet - PCF 102, PCF-62