I have a Wait4Me tune installed in my truck and I am unsure if I asked him to have the electric fans come on. Is there a non-invasive way to check so I do not go through the hassle of the install and NOT have them work. I plan on using Nelson's fan harness (with upgraded 5 prong relays). Thanks for your time and help!

 

If it is turned on pin 43 (i think) will trip a ground when it hits the temperature set in the pcm. You would have put a pin and wire into the 43 slot. Rig it to a realy or something that perhaps turns on a light. Might have to take the serpentine belt off to allow it to get warm enough to trigger.

Hell the easiest way is to get somebody with a tuner to check it.

 

Its pin 42 on the blue plug. You can use an ohm meter if you have one, or find someone with a way of tuning to look. If you havent got the harness yet PM me.

 

Yeah an ohm meter. I'm so stupid sometimes.