Purchased a 1999 Gulfstream Conquest in May. There are 3 brand shore batteries, all brand new. The rv acts as if only 1 of the shore batteries is active. I tested the voltage at the batteries with ...
Welcome to RV.NET Normally a gas engine MH will only have 1 battery for start. The 2 batteries in the back should be for the house. The switch in back would be to connect the batteries to house electrical. Could also be a way to connect all batteries together. -12 volts could be because test lead were reversed. Could also be that batteries were installed with positive and negative reversed on batteries.