Can anyone help??? I recently changed the oil and filter in my Onan 7500Kw genny in a 2000 Holiday Rambler Ambassador diesel pusher, and the generators been having starting issues ever since. When I start the genny, it will run for 20-30 seconds and then shut down. It sometimes does this once and starts up and runs on the second start-up, or it will do it twice and then starts on the 3rd attempt (always, never more). It's almost like when it should start to draw on something, it shuts down. I did notice when I turned the water pump on, 45 sec-minute after generator start-up, (which was after noticing the genny was powering stuff - lights got brighter) and it shut down on me. It does it even when I don't have anything plugged in (I believe). It will also go through this start-up process if I shut down the genny, and then need to start it up 20-30 minutes later while its still warm. Could I have screwed up something simple during the oil change? I double and triple checked I put the right amount of oil in, plug back in, filters on tight (not too tight),...The fault code that comes up is just 2 flashes, nothing else. Does it have anything to do with our new house batteries that seem to die over the course of the day, while running very few lights??? Or is this another problem I'm going to need to start researching??? Shouldn't the house batteries charge throughout the day as I drive??? Does it hurt the generator to run it for only 20-30 minutes in the a.m. while making breakfast, then again while making dinner?