Well, mine has never worked and I bought the coach new.
That said, my initial contact with Thor ended with them telling me where they thought the Intellitec BIRD (and I know what I think it looks like) was located but it was not. This is not the first incidence of this kind of problem and I attribute it to the fact my coach was actually started at Damon, is titled as a Damon, and was apparently an early delivery while Thor was buying Damon.
None of my electrical schematics have this system on it, but I will be requesting the engineering drawings.
Supposedly there are fuses on the 12v bus that can trip keeping the charging function from working, but again discovering and identifying them is a problem without a little better documentation.
It's complicated when you don't know what you don't know.