I have two 6 volt batteries connected in series so there is only one 12v negative wire connected to the batteries. The disconnect switch is in this wiring. So when open, there should be no ground connection, and no current flow. As I think more about this, I need to do more troubleshooting. I haven't checked the emergency switch so I may have the chassis and house batteries unintentionally connected. I really hate chasing ground problems.
When I was in college, the Chemical Engineering dept had a plaque that said
A Chemical Engineer knows
Enough Chemistry to confuse a mathematician
Enough Mathematics to confuse his boss
And enough Electricity to confuse himself.
At the moment I'm confused. To quote an old machinery engineer - we had an electrical problem. Somebody let the smoke out.
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