Wiring diagram for engine compartment with factory AC

[Jerblazer72]

everyone,
I have a 72 gmc truck and 72 blazer cst. Both with factory air set up. I am putting the engine back into the truck and want to eventually get the ac running. Problem is that the wiring was not hooked up to the AC on either vehicle and I dont know what goes where. If I remember right there was a solonoid on the carb that kicked it up a bit when the ac was on, but I can find no info on this or any other items for the ac wiring. If I do a forum search it dumps the words air, conditioning, and ac as being too common or long. Can someone/anyone please point me in the right direction?
I have looked at the color wiring diagram in the sticky section under electrical but there is no ac shown. Thanks in advance for any help.