AC thermostat problem

[Steve Sullivan]

I have a 2007 Challenger 5th wheel 35CKQ with either having air conditioner or thermostat problem not sure which. When the AC is turned on it runs for a short time but pops the AC breaker, but the furnace tries to run at the same time. I have checked all fuses / breakers. I have double checked the connections to the convertor and tightened any and all loose connections. Another thing I've noticed is the AC / heater has issues when the center lights to the living room will not turn on. It seems when the lights are working correctly the AC works correctly. I have disabled the wiring to this light switch and tried running the AC again, the same issue with the AC and furnance trying to run at the same time happens.