Is there a good flow chart of what to check, maybe with actual volts, ohms, etc and good clear pics of which pins, etc? I couldn't remove the big black fan plug in the under hood fusebox. Appears to be hanging tough do to long white plastic retainer leg. I guess I'll just bust that sucker off? I'll probably just end up doing another one of my standard by-pass and manual toggle switch through the firewall, but I thought I'd at least TRY doing it right.