Steve,
I can't answer your question of how to tell, but about 3 years ago I noticed the same problem. It was the alternator! I had it re-built ($540) and it has been working great ever since. I might add that I could have purchased a new one for about the same amount.
I wish I would have bought a new one.
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Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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