Batteries won't work without a good chassis ground. All the circuit breakers, high amperage circuit breakers and relays work on the positive side of the battery. I suggest you dropped the ground cable when removing the batteries. Look in the back of the battery compartment or under the coach for the HD chassis ground cable. Since you have an inverter, the ground is probably a 0/0 cable or possibly a 0/2 depending on the length of the run.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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