[pairodice]

On my coach the guage is never accurate - I got a VMSpc for that reason. Check the battery connection are tight and don't wiggle for ALL the batteries (since you have the wrench in your hands). You might also clean them while you are there with a wire brush.
You will need to use the switch on the dashboard (assuming you have one) that is labeled 'Battery Merge' ONLY while stopped and ONLY while plugged in to shore power (Newell doesn't recommend charging this way with the generator as it has a small alternator on it). This will make sure your engine batteries (the ones showing on your dash) are being charged overnight. Make SURE to turn that switch OFF in the morning before cranking the engine. The reason you don't want to leave that switch on is because the engine alternator will be trying to keep ALL the coach batteries full and it will shorten its life considerably. You can always MERGE the batteries in the morning to help with starting in case your engine batts are really dead - just make sure to turn it off when done.
If all else fails call the mother ship (Newell) - they are excellent and really do help!