Re: Electric radiator fans won't come on
This thread is a good example of how difficult troubleshooting wiring is over the internet. And it is an excellent example of someone responding quickly to suggestions with feedback, and a good primer on relays. I'm glad you got them spinning now, hope they help. I'd use fans like that as an assist, but not as my only cooling, and I'd wire them up totally separate, so if any one component fails, at least 1 fan will work.
Plus I wouldn't bother with a temperature switch, when I had an electric assist fan, I just wired a switch to turn on the relay (off of +12, not ign) so I could turn it on ahead of time and leave it on, even after shutting the car down to cool off the rad more (just don't forget and kill the battery).
1967 El Camino Malibu - Deepwater Blue
ZZ4 350, FiTech 600 complete!,Roadmaster tank, 700R4, Underdash A/C in progress, JGC Steering, 1990s truck serpentine.