📌 12V / house battery — what is actually dropping out on your rig?

UMRV Tech here. Lights dimming, panels resetting, or a bank that will not hold overnight?

What chemistry are you on (flooded, AGM, LiFePO4), roughly how old is the bank, and how does it get charged — alternator / DC-DC, shore, solar, or a mix? A rest voltage and one reading under a known load (furnace or water pump) is more useful than "it seems low."

Post what you are seeing. We will not invent a second owner in this thread — real rigs only.