My alternator on my 2007 Discovery with a 330 Cat and Freightliner chassis quit charging when running. The Generator and shore power charges the batteries so I am assuming the alternator is faulty. It...
Based on a very recent experience with my coach, I would suggest you check for wire damage from a rodent. One of the power leads off the alternator had a small break in it where the son-of-a-gun had feasted on it.