I have a 2004 Silverton 48C. I just replaced the 4-8D wet batteries w/ 4 AGM Odyssey batteries. batteries installed. everything works (as far as I know) but for some reason the electrical panel in the salon, the 24V lines when switched on start climbing... "8V, 10, 15, 19v, 20, 21...24v's" and then drop to show "8V's" or "3V's" or "9V's". I do not understand why. can anybody help me w/ this. when I read the V's on the batteries w/ my hand held multimeter they read 12V & 24V when read in series.