Super frustrating AC issue

kfp673 wrote:
Purple wire comes off the back of the selector knob. At the back of the selector knob it has 120v, it then runs via the harness up to the housing where the capacitors live where it is spliced to a back cable. 120V show there as well. Black cable then runs to the compressor which has 120v (actually they all ready about 117 + or -. Both sides of the capacitor also reads the same 117 ish.

T-stat has different colored wires including white. Anyone know how to properly test a rotary t-stat with a meter? The ceiling unit is model 9430D7153. I find it strange that I hear and feel no "click" when I rotate the t-stat knob. I would think I would feel that if it were working and sending a signal to the compressor to engage.

If you have 120V everywhere on the compressor you don’t have a complete circuit. Look here for a Coleman wiring diagram which likely is similar/the same as yours: https://ricardolevinsmorales.com/wp-content/uploads/2018/09/coleman-mach-air-conditioner-wiring-diagram-coleman-rv-air-conditioner-wiring-diagram-unique-excellent-coleman-2-wire-thermostat-ideas-electrical-and-wiring-9a.jpg

In that diagram the yellow wire from the thermostat should be connected to the neutral (white) wire when on. If the yellow wire is at 120v it means it is open circuit and being pulled up through the compressor coil.

I’d say you have an issue at the thermostat. If it’s like the above diagram, white should connect to yellow when calling for cooling. You should be able to manually override by connecting yellow to white.