Derale 16788 High Amperage Dual Fan Controller Push In Probe

I put this on my jeep rock crawler. I love the fact that it only utilizes the second fan if needed but has to be adjusted accordingly. Adjustment in the driveway was not sufficient. Once on the trail when the second fan was needed it was coming on hotter than desired temperature. I backed the screw out 5 turns to bring the second fan on at desired temperature and had a great weekend. Instructions were helpful, about one turn equals 3 degrees difference. It did not however tell me which way to turn the screw for increase or decrease in temp but was easy enough to figure out. Left is decrease in temp, right increases temp. I suggest setting the desired temp with one fan, then decrease the temp by turning the adjustment screw 5 turns to the left. That should get you where you want to be. All of this is on a TX jeep and tested 100 degree temperatures in an extreme environment in 4x4 low and low speeds. This should fix my problems with melting relays and wires. 35 amps per fan should be sufficient for most fans but check the amp draw on your fan to be sure before ordering.