Hi, first time poster here. I have a 92' K1500 Blazer 5 speed manual with a 1614299 (747) ecm. Started wiring a harness for a 0411 swap and am not clear on a few functions of this ecm. Donor harness is from a 00' express van. Plan is to use EFI live, what you guys are on the verge of doing with flashing a LS1 ecm is way over my head.

I have quite a few questions but will just ask one for now.

C2 Red 17 is A/C request. Right now I have electric fans setup with dk grn/wht going to a relay to engage high speed fan. Thinking I can eliminate this relay if my assumption that R17 switches R33 (high speed fan) to ground through the ecm?

BTW is there a book that explains all of the functions of a 0411?