I had this same issue on my 2017 Quantum WS31. 4 times I took it to LaMesa RV in Port St Lucie, FL. 4 times they said nothing was wrong. In 1.5 years, I went through 3 sets of house batteries. Thor sent me the parts. Trombetta and relay isolator work together, so it's best to change both. Been working fine ever since. These parts were under the coolant reservoir.
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