HELP!!! Coach batteries not recognized by inverter

[MtLaw]

We have an 85 Prevost which has had fairly substantial updates. Several years ago we had a new Magnum inverter/battery charger installed. The unit has a substantial set of house batteries which are all new. The coach also has a set of batteries (not new but good). The coach also has a generator which has its own battery for charging, which is also new. The coach has a 24 volt system and the house batteries are wired so as to deliver both 24 and 12 volts depending on the need. None of these thing have been modified recently.

The coach has 2 merge switches which 1. join the house batteries with the coach batteries and 2. join the house batteries with the generator start battery.

The house batteries were replaced this year. The guy who did it for me is very bright and handy and believes the coach worked properly after he was done w/ the new coach battery installation.

We took the bus out for a test weekend and found that the house batteries are not being recognized by the inverter. When we hit the merge switches the inverter kicks on, drawing from the starter batteries for the coach and the generator. However when the merge switches are flipped off, the remote controller for the Magnum says "low battery" and the inverter does not recognize the house batteries. The house batteries are fully charged.


We have spent 3 days trying to figure this out

Any ideas or suggestions would be greatly appreciated!!!!!!!!

[Francesca_Knowl]

MtLaw wrote:


The house batteries were replaced this year. The guy who did it for me is very bright and handy and believes the coach worked properly after he was done w/ the new coach battery installation.

I know nothing whatsoever about batteries, but EVERYTHING about tracking down the source of a problem that arises immediately after a self-described "expert" works on something. (This from almost thirty years of marriage to such an expert 😉 )

Regardless of what your helper "believes", the coach doesn't now do what it did before he got his hands on it. He's the only person that knows what he did to cause the change- he should track back through every step and find out where the mistake came in.

With you watching, I might add...