[cknuth]

        At the risk of replying to a 7-year-old thread....

Chester, I'm finally replacing your golf cart batteries with Battle Born lithiums.  There will also be some changes to the charging equipment, so I'm making as-built and revised diagrams of the cabling.  And it raises some of the same questions you had back when you did the last change. 

- The cutoff switch is on the negative house battery connection, and it only disconnects a chassis ground (there is a shunt upstream of the switch.)    The input side of the switch is basically a terminal block for the cable that continues to the inverter.    So what's the function of this switch?    When it's off, the coach still gets 12V, and the inverter is still charging the house batteries.

- Why indeed are there two different positive cables, one from each end of the battery bank?    One goes to a terminal block that appears to connect Echo charger, house load center, and battery isolator.  The other appears to go to the inverter.

- I have not found any over-current protection on any of this - is there a big breaker somewhere on the positive side?  Magnum certainly recommends it.

- Is that bundle of small wires that's connected across the shunt the sensor for the Xantrex battery monitor?

I hope this finds you well and pleasantly occupied during this unique time.

Chuck