Thor Forums

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Your batteries are not charged.

Running the engine for a few minutes put a small charge on them - they quickly die again.

You have to disconnect the batteries when not using the RV with the battery disconnect switch if not plugged into SP. The fact that your batteries were dead means you could not have moved the battery disconnect to the ON position if it was in the OFF position until you got a charge in the batteries. So if the latching relay really was in the ON position, it had to have been left that way.

So, as others have said, check your batteries' water level, charge them for a day, and then have them load tested to see what their status is. If they are the original batteries and you got two years out of them after being drained and abused multiple times on the dealer's lot, and now just recently drained by you, they may indeed need to be replaced.