Same here.......
I spoke to Precision Circuits a year ago and they told me the same thing.... that is didn't matter which way it was wired. They even sent me a replacement BIM160.
I installed the new BIM and the behavior did not change. Then after searching other coach manufacturer forums, I found they all wire the BIM opposite of Thor.
As soon as I moved the chassis battery cable and the wire for the chassis voltage monitoing to the BATT-A post and moved the house batteries to BATT-B, all the problems went away and it started working as designed. I also verified the SIG post went to the emergency start switch.
Two other things I considered that made me think the other manufacturers were right......
First.... the IGN post is directly above the BATT-A post. I could not get the schematics the circuit board inside the BIM but I am guessing that has an impact on operation because schematics I have seen show that going to the chassis batteris.
Second... from information that I read about the the BIM for LI batteries, the chassis battery MUST be connected to the BATT-A post. It looks identical to the BIM 160/225 but we know LI batteries need to be handled differently.
Now I have a diesel but I can't imagine it matters between a gasser and a diesel... even though I have two chassis batteries.
All I know is putting in a new BIM160 didn't fix the problem but wiring it the way the other coach manufacturers did solve all of my issues.
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