Originally Posted by Cumura72
No I've haven't had the generator started. Just changed the battery to make sure and still same results. Check voltage at the external power source coming in ahowed 120 volts. So I've pretty much led myself to believe it's the inverter
OK, I just realized you have a generator onboard. It's possible your problems are being caused by a bad transfer switch.
This video explains it in principle. You may want to do a forum search on the transfer switch as we have had many threads on them: