I guess there's a first for everything. My new house system was working fine for about three weeks and then for reason it went gunny bag. It's been driving me nuts!
Turns out the cable that ties the two 6 volt batteries together to make it a 12 volt system had a bad end on it. This is a brand new cable installed in late May of this year and Sal at the Bay Company here in Craig figured a little water got into the cable end and then the high amperage quickly corroded the end. New cable...problem solved. Without Sal's load tester it would have taken forever to identify this problem.
I post this so someone else might learn from it. Electricity and boats...gotta love it!