On my 73 I've owned since this May, I have a Generac Guardian RV generator that had been working fine. Recently it wouldn't start and seemed to be the battery which looked kinda old. So got a new battery. charged it and gen started fine, but after a few hours died. The battery was discharged, so I jumped it and started right up. Disconnect the jump box and after about a minute the gen stops. Just to be sure I checked the fuel lines, filter and pump - all OK. Tried jumping again, started, this time left the jump box on. The gen stayed running for about 10 minutes so I disconnected the jump box and within a couple minutes the gen stopped. Next, put a trickle charger on the battery overnight. It started right up and kept running so after about half an hour I turned on the AC which worked fine. The fridge was working etc. This was yesterday, I shut it down then went out today and no go.
So it is providing power to the house fine but not charging its own starter battery. How can this be? There my also be some parasitic drain that is probably related, but not sure on that one.
Waddaya think?

Shane