I had a continuos duty solenoid sitting on a shelf, so that's what I used to get it running. They look like a standard Ford starter solenoid, but handle 80 amps and are designed for continuos use. I think they are about 25 bucks at NAPA. Simple as hell to wire up with a toggle. Eventually I will probably change it out to a relay with a temperature switch, but for a mudder or a puller that sees little to no street time I think it works great. I switch it on before a pull when I'm getting my oil temp up, then again right before I leave the line. My water temp is about 165 when I leave the line generally, and it ends up close to 190 or more by the end of the hook. The fan will usually have it back to 180 or so by the time I get back to the trailer. I put quite a few road miles on my truck as well(10:1 472), and I only switch on the fan if I come to a stop light. Other than that the radiator seems to do a good job. My .002.I was able to find one of these fans, can I just wire direct without any problems, just using a toggle switch
I used a jigsaw with guide plate and trimmed about 1/2" off of the face of the shroud where it meets the radiator (making sure not to take too much so that the fan doesn't hit the radiator). Then I used the plastic zip style electric fan kit to attach it to the radiator. It fit my aluminum radiator like it was made for it! I ended up with about 3/4" space between the fan motor and the end of my water pump. Take a look at this link:What did you guys do to get this fan to fit my doesnt clear the pulleys. ?