Put a Champion 526 radiator in a 71 swinger?

I am about to do this setup also with the Dakota controller and was wondering if the small red wire in golduster diagram marked 12v constant is supplying 12v constant to the relays or is it tied in somewhere else and supplying both the relays and the controller with 12v constant because I see a 12v key on wire but don't see where the 12v constant comes from also could the small red on the relay be powered direct with fuse from starter relay
thanks