So if it boils with the alternator, it's a good bet it is a bad battery.
While I had pretty good luck with the two Harris batteries in my coach (they lasted 5 seasons), I think I'd just replace them with better batteries (Interstate, etc), and be done with it as it seems many have had bad experiences with Harris.
You don't want to be messing with bad batteries each time you want to use the RV.
I just replaced my batteries last week. I did a lot of looking around for batteries, and ended up buying two Interstate batteries. I have had good luck with Interstate deep cycle (had them on my last two boats).
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The only thing that works on a RV is the owner...
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