I did meet with the yard owner, and the guy who physically did the install. The owner obviously doesn't know anything about electronics
- instead he relies on his employees.
I showed him the diagram of how they had it wired - and had a list of corrections that needed to be made.
The employee had egg on his face - he knew he was wrong. He started babbling some stuff that the inverter
had to be hooked directly to the batteries on the negative side. I said "really - I doubt the presence of an inverter
would make it impossible to ever have a battery monitor installed".
So they are going to need to do some extensive rewiring. I have to bring the boat back at the end of August for a 90 day check up - they are going to fix it then (it's current
home is about 6 hours away from the yard).
So thanks again to everyone that helped!