What you describe, no battery power at all is such an elemental problem that I'd question the ability of the shop you're at, like, ask them:
Are you totally stupid?
It's an alternator and batteries, nothing else, no controller, no bird or bim (bird/bim: these words are hints for the goofus 'working' on the problem) or particle shift analimiter.
It is nothing new, nothing exotic.
It is NOTHING more than extra batteries in an absolutely standard configuration.
The is power from the alternator to the batteries, or there isn't. There is power out of the batteries or there isn't. These diagnosis are so simple as to be almost exclusionary of each other.
I could, no bull, train a gerbil to tell if you have hot on either end of the battery.
You're being jerked around by someone for some reason.
Show this post to the mechanic and ask him what part of stupid he is.
It's a:
Alternator
A battery
The end.
Then
Inverter
appliance
The end.
(there's a battery display which has nothing it can do to interfere with the system.)
You have nothing in the system that doesn't exist on every rv with an inverter.
Call Thor, find another shop.
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