Engine batteries not charging

jaycocamper62301 wrote:
I have my 2006 Bounder 37U here at home in my shop and has been hooked up to shore power since Wednesday. House batteries are charging and chassis batteries are not. Now the RV won't start. Where do I start. I have a Big Boy battery isolator ad it has 13.4 volts on one post and 11.5 on the other. All interstate batteries are 2 years old

4 days and the chassis batteries won't start the engine is not related to the shore charger.

The rig should sit for a month+ and still start the engine with no shore power. Load test the batteries as even 2 year old batteries fail. Then cables, solenoid, starter or starter circuit. Or you may have a very high drain from somewhere. Voltmeters and ammeters (especially clamp on) are your friend.

You may/may not also have a shore charging problem but that doesn't solve the 4 day starting problem.