So after further investigation, here's what I figured out. My Thor Four Winds does not have a BIRD. It has an IRD, but not a BIRD. It's an Isolator Relay Delay, so it only works one direction, from Chassis to Coach, not the other way. Even though my owners manual shows a BIRD. I'm disappointed in Thor for not spending the extra $50 to install a BIRD buy my lack of knowledge when purchasing the RV is ultimately to blame.
So, I'm going to install a BIRD (00362-100) and a new isolator relay since the old one is corroded pretty bad.
Also, I tested the Aux start switch after installing the fuse, and it works great. So the IRD is working as advertised, just not the way I want it to ��
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