Annette Cleveland

Thank you Ed. Indeed the isolation relay had gone bad. The part is on order by the shop that is fixing it for me.

The manual can be downloaded from a link on the forum. Go to the Motorhome Tech Topic section of the forum. The sticky at the top has a link to the manual.

On your house batteries not charging off the alternator. Simple thing first -- do you have the USE/STORE switch in USE when you are driving down the road. House batteries will only charge with the switch in USE. If that's not it you might have a bad Trombetta Isolation relay). You'll find that discussed in the manual. Lastly your house batteries may be bad -- although you said they charge off shore power. Don't think it's a ground on the alternator because your chassis battery is charging.