My NADP was in for some maintenance items and then off to a body shop for repairs from an accident. Between the maintenance items (at an authorized dealer who couldn't keep the coach plugged in) and the body shop (which just didn't plug it in), I am now in this situation. The coach is ready to return to me (it's been 2 months) ... but I was told the house batteries read 0.7 volts. I forgot to ask where that measurement was taken.
I verified with Discover (battery manufacturer) that this places the battery in an unrecoverable state.
Diamond RV is charging them overnight and will do a load test in the morning. But if that array truly read 0.7, I'll be demanding a replacement.
Could they have been disconnected by removing the wire? Sure. But guess what - everyone who works on these will believe the "Battery disconnect" switch at the stairs is good enough.
It is not.
I gave explicit instructions regarding this -- keep it plugged in, use AGS, whatever; because the disconnect is not sufficient.
So, if you're having it serviced, make sure they physically disconnect the batteries. Put a sign on the disconnect switch (because your message to physically disconnect won't make it to whoever's working on it). Install your own disconnect (I will be). And make sure you can monitor it.
I'll know more tomorrow.