Don't feel bad. I consider myself an "experienced" RVer. I can quote verses from "The 12V Side of Life". I've installed new converter/chargers, solar systems, the works.
And yet on my new-to-me coach I never noticed that the chassis battery wasn't charging when on shore power. All those USB chargers and gadgets I installed sucked my chassis battery down to 4 volts. Since it was old, and I needed to get on the road that afternoon, I bought a new battery.
Next project: hard-wiring in a smart charger for the chassis!
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