I just purchased a 1999 Southwind with a Onan 5500 GenSet. The generator has been having a problem staying running. It would run for say a hour or so then just shut off. It would restart easily but would do the same thing later on. I have replaced the fuel filter and and checked the fuel pump and it appears to be working fine. I noticed that both batteries for the coach were completely shot and have replaced them with new ones. The generator was running when I disconnected the battery and it died immediately. Now the gen. is starting and running but the A/C will not come on. My question is why ?? Could the bad batteries that had corrosion on the terminals caused the gen. to shut down randomly ? And why now that its running, I don't have electricity ?? Any help would be greatly appreciated.