So, a while ago I bought a new in the box rooftop AC unit for my travel trailer from a guy on craigslist. Unfortunately, I didn't get around to installing it until now and I may have been ripped off, but maybe I just screwed something up. When I am plugged into shore power and I turn the AC unit on to "cool" nothing happens, the compressor doesn't run, the fan doesn't run, nothing. If I turn it onto just "fan" nothing happens either. I took the cover off the top to check if there was power up there and there is a full 115V going to the compressor and the fan. All 4 wires on the compressor (grey, blue, red, brown in the pic below) have 115V when the switch is in the "cool" position. I took some resistance measurements between the compressor terminals, but don't know what to make of them other than it doesn't seem to be shorted or a broken wire inside. I got: 0.5 ohms between R and C 3.7 ohms between S and C 4 ohms between R and S Any help, insight, advice, or name calling appreciated.