One Relay or Two

We run this relay kit on a dual fan factory Jensen cooling system. Car has about 25K original and has been garaged so it is in great shape. (Valve covers were done by Leanna last spring)

The fan motors and blades are archaic but seem to blow a very powerful volume of air.

Our problem is the motors are behaving a bit wierd, one runs a little slower than the other, the bushings were dry from sitting for years (25 in a grarage in New Mexico) and I attempted to refurbish the motors but didnt get the armatures lined up perfectly with the induction field I dont believe. I am probably looking into replacing the motors with new blower motors off chrysler non ac heater fans.

but the relay kit works like a champ. I tested the amp pull on the motors and they did not pull 40 amps constant combined, so I went with a 1 relay kit.

Like I mentioned, i pushed the thermocouple bulb into the fins at the cool side of the rad, that way if the rad was cooling fine from forced air thru, the fans would not respond, but when the cool end got hotter from lack of air flow, the fans would kick on.

I should add that this unit I linked to has two power out leads, one for each fan and it turns them both on simultaneously. In our application this is how the factory had it, but the factory electronics, much like Mopar are not only old as hell and full of spiders but were severely anemic fin design so I just cleanly bypassed the factory system and left it in place in case of restoration needs.