Ok, from the sounds of it I am going to make an assumption.
The thermostat and controls are part of the Air Conditioner lower (indoor) unit and not mounted on the wall.. IF this is not true skip to I WAS WRONG.
here is your schematic
Main power panel... Breaker (most likely 20 amp) Wires----Air conditioner.
Thats all folks.. one wire (Well Romex cable) runs from Box to A/C ..
If I was wrong
You then hav the above 120 volt wiring
in addition you have two (or more) additional wires
These run to the 12 volt fuse panel and to the thermostat (on to the fuse panel on a fuse.. one to ground (most likely white) and the rest to the T-Stat.
Home is where I park it!