tr 4 cyl:

hey guys not up on the electrical side of things... basically need to hook up a switch to turn on my thermo fans constantly, and when i switch it off have it revert to its original function of only coming on when it gets warm.
basically asking which wire do i connect power to to do this? any issues with relays or blowing fuses etc?

you'll wanna supply power to the relay's coil to set the relay.

i had this set up in my car.

hehe colder engine makes more power!!!