[Richard]

I agree with Russ. Put start caps on as the next step.

Those of us with dometic basement units would tell you the condenser fan motor bushings are kaput. It is a common failure. The motor does not have sealed bearing but an oilite (bronze oil impregnated) bushing instead. Only problem is that you cannot get to it easily to lube, so it eventually fails and the motor won't start. My symptoms were loud buzzing from basement unit,, followed eventually by tripped breaker. Replaced the start cap, added hard star cap no go. Replace fan motor and all was well. I too was freaked that I had the dreaded locked rotor on the compressor, but it was the fan motor.