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What is the rated output of the genset? Do you have anything else on so far as AC loads like the fridge or water heater? Did you actually take an AC output reading on the genset to see if it is putting out the proper voltage? I like the one by Electracheck called a Voltage Minder. You can plug it into a plug and it monitors the voltage and cycles and gives you any ground faults or polarity issues. Very handy! This sounds like too low a voltage or inadequate power out of the genset. Try it on shore cord and see if it acts the same. That would be a good way to check it by comparison. Hope that proves helpful here. Please get bak to me if you need more as all follow ups are included in our fee. R.J.
I checked voltage output with a volt/ohmeter at 123 ACV --no load, and 121 ACV with the A/C running yesterday. Only ran once the whole day, the rest of the times I tried it, it would just pull down. This unit does not have a shore cord--strictly genset. No other loads on except an overhead light.
What did your testing on the A/C compressor show? I am enclosing a link to the Dometic A/C service manual and if you check the section on testing the compressor I think it will be very helpful here. Great to have and I would print out a copy so you have it. R.J.