http://www.ffdynamics.com/

 

The switch is wired off the yellow wire from the controller that is also wired into the ignition source as indicated in the instructions. Everything works perfect except the switch will not kill Fan # 2 wired to the second relay not the controller .

 

You'll need to call the company and find out what that blue wire is feeding to the secondary relay. Is it the key-on ignition signal or temp probe signal? If it's the ignition signal, I'd say the relay or fan controller is bad. If it's the temp probe, then hot temps are the reason it won't shut off.

When a signal comes down that blue wire to the secondary relay, it completes a circuit to the black ground wire at pin 86. That in turn energizes the "gate" in the relay to allow current to flow from pin 30 to pin 87. The signal from the blue wire is what allows the 2nd fan to blow.

 

OK...I called them and they gave me a series of tests to do with a test light. They claim that my wiring is bad...I say that I followed the directions and triple checked them. They want me to do several tests on that blue wire and that will tell them if i have wired it correctly. I will Let you know what happens....I am also gonna switch the secondary relay with one I purchased @ NAPA and see if it fixes the problem.

 

Well I changed the relay and it works perfectly.....there is a 5 second delay for fan # 2 to shut off , but I can live with that . Thanks for all your help Guys !!!!

 

Glad it was a cheap and easy fix. It can be maddening when it comes down to a faulty part.

 

looks to me like the second relay maybe getting its trip signal from the a/c . Was the a/c on during these tests? Green wire into contrller, does it have voltage when bypass switch is opened? that is I mean turned off with the ignition on.