Dometic 3313189.000 Furnace Wiring

[Challenger.]

What is the proper furnace wiring scheme for the Dometic 3313189.000 single-zone thermostat with a 15K Brisk Air AC unit, and standard supplied control box? We have the air portion working fine, and have the standard RV gas furnace.

I was told by Dometic "Tech?" that all I need is two sense wires from the furnace (possibly blue) hooked to the control box lugs. Should I just trace the furnace wiring and hope I fine the proper wiring? There are two small wires marked "furnace" up in the air vent/return box.

I assuming the power and ground from the furnace are controlled independently of the "mysterious" sense wires.

Thanks for any help.

[RV Wizard]

The two wire coming from the furnace are a switch leg. The air conditioner control board (in the box) connects and disconnects the switch leg to bring on or turn off the furnace. There are schematics and service manuals in our "Files" section for Dometic air cond. Good luck and keep us posted.