The thing about using 2 relays is, if your fan turns on and off a lot the relays can wear out or burn out faster, with 2, they last longer ... don't heat up as much.

See MadElectrical.com\'s explanation ... scroll down to ELECTRIC RADIATOR FAN SYSTEMS.

~~ Alan Horvath
1954 Chevy Pickup
Singing his praises in the
Passing Lane