Haven't check the volts yet but I did notice that the two house batteries are connected from positive to the negative on one battery and that goes to the positive on the other battery. The ground is only on the negative side of the one battery.
Does that seem like its correct. would have thought that the positives could piggyback but not with the negative in the middle.
It's kind of like this RV+ cable to + on battery #1. Jumper from battery #1 + to - on battery #1. Jumper from Battery #1 - to + on battery #2. Then battery #2 neg is grounded.
Thanks
Rico