Constant 12v source but I haven't checked the ground yet but I have my doubts that it's the ground. I think I may just fuse the feed and trigger with the ground given it has a groundYou need the relays.
Have you tried to use another ground source to verify FiTech is sending the ground? Have you verified your ignition 12v source? I’ve wired a few cars/trucks (mine twice) using FiTech as the fan trigger and haven’t had any problems.





