I've done a ton of searches but still need clarification here, which relay is which? I have an 89 Iroc with dual fans. My fan relays are next to the battery(pass side) on the front fender and in front of the battery next to the radiator. Which of these is primary and which is secondary?

 

your looking for the F wire on the relay that goes to the fan switch, that would be the secondary fan relay.

 

Thanks for the diagram. My question is due to the fact that the wires were cut a few years ago (by me) and wired to different relays that operate only off of switches in the passenger compartment. I want to return the setup to stock, but am not sure which relay is which.

It appears that the one next to the radiator is primary, with the one on the fender secondary, but I wanted to confirm. Can anyone clarify this for me?

 

Also am I correct in assuming that both fans share the same ground wire?