Pop Up Camper in Roof ac unit wont work?

My son in law has a pop up camper and the roof ac unit wont work you turn it on and the condensor fans runs but the compressor wont kick in, I was told the start up relay normally goes bad, but I have check voltage on all the relays and capacitors and there is 120 volts on all connections, i check the top of the... show more My son in law has a pop up camper and the roof ac unit wont work you turn it on and the condensor fans runs but the compressor wont kick in, I was told the start up relay normally goes bad, but I have check voltage on all the relays and capacitors and there is 120 volts on all connections, i check the top of the compressor and there are 3 connectors and they all have 120 volts, so my question is this voltage to low to high or what, I don't know to much about these but I did start checking wires and everything has 120 volts???????
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