[Jack Houpe]

I would suggest to unmerge the batteries then let rest with no load no charger then take voltage readings of each battery bank. Anything under 12.2v is questionable. I'm not fond of the merge relay it should be defined as an Emergency Merge only, I've seen many who use this as a permeant fix to bad batteries. If you have a set of good batteries and a set of bad batteries the bad will take down the good even with a trickle charger over time.

There is a fellow member here that had the identical problem your seeing and after we discussed on what to do to solve it I asked him to take a GOOD pair of jumper cables and put the negative lead on the battery then the other negative lead to a good clean place on the frame and the coach fired up. His negative post on the battery was compromised.