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These are the 12 volt DC power wires to the new control box, that I am looking for.Do you mean the thermostat wires? Was your trailer pre-wired? On my trailer they were tucked up in the ceiling about an arm's length away and the other end was in the wall by the other thermostat. I didn't use the t'stat wires for my second unit since it was in the bedroom and the thermostat was out in the hallway. Never understood the reasoning for that, but I used a manual plenum since I could reach the unit easily.
Dometic 331 15,000 non-ducket 110vWhat kind of A/C unit is on there now? NORMALLY they would run the same type of wiring for both units.