My '20 Magnitude SV34 came with a BIM160 and as I have posted many times, Thor wired it incorrectly and that was the source of my problems.
After posting my findings and ways to test whether a BIM160 was wired properly a couple years ago, many people found their BIM160 was also wired incorrectly from Thor and causing their 12V electrical problems.
My theory on why this happened so regularly is that the schematics show the BIM mounted upside down but the guys on the assembly line mount it right side up. Then they attach the wiring the way they see it on the schematics and as a result it wired backwards.
Once the wiring issue is corrected, the BIM starts operating the way it was designed.... and no more issues.
So in this case, the BIM was not the issue at all. It was Thor wiring it improperly and shooting themselves and their customers in the foot.