dunno, i got my fan from sumit.direct factory replacement for the 5.0L comes with wires and temp probe goes on anywhere from 180 to 290(you controle that) and you basicly hook it up and 4 get about it. you also can put a switch on it as well that can be used as an always on. it also taps into the a/c so when you turn on the a/c the fan goes on. Basicly takes care of all of your needs, street use and track use. best fan i've ever seen/had
Well i have a big relay for my Mark 8. It looks similar to the starter solenoid. The relays that came with the ramchargers fan that i bought are much smaller and dont have actual posts, but its the same exact wiring set-up. My relay is right where my battery used to be. You can put it just about anywhere you want, within reason of course
thats the link to the summit site for some more info. it dosnt inclue the manual overide switch, but you can pick on up anywhere, it's just a 12V switch, and then run the wires. Def not hard compared to what other ppl have done. Have fun dude, it was well worth the $ to me. fit right into place works great , has good clearenc for my blower belt as well, some ppl have run into trouble with clearence issuses.
if you have your switch set up so that it is only on with the car (as Jerry mentioned. Jerry, glad to see you in here , you are in biz. if not, find a wire in the fuse box, etc that is only on with the key. dont worry about draw, as this wire will only need around 150mA to trigger the relay. hook this wire to the switch on the "power" terminal.
now find where you want your relay (i have some around the windshield wiper motor, , but its your choice, as timmy mentioned. closer to the fan is always better, IMO.
now find the wire that you have now running from your switch to the fan. this will be your trigger for the relay. cut the wire where your relay will be.
there are several ways to wire the relay, but this is one way that works if you dont understand how they work.
hook the cut wire coming from the switch to terminal 85
hook the other cut wire end (going to fan) to terminal 87
hook a ground wire to terminal 86
hook battery juice (run a wire from the hot side of the starter solenoid -side with all the wires connected to it- with a FUSE, to terminal 30.
make sure that your wire from the relay to the fan is the correct AWG (gauge). same for the wire going from battery (solenoid) to the relay and the ground wire. cant go too big with a ground wire, IMHO. these wires supply the relay, and thus fan, with power, so you want full juice getting to the fan.
there are also ways to wire it so that the fan comes on with the a/c. basically i would tap into a wire that is hot when the a/c is on, using that as a trigger for another relay, which has output going to the fan.
as for the 2 speed fan, as i recall, Jerry runs his at low speed and seems to do fine. for simplicity, i would probably use a secondary temp probe to energize a relay to turn it to high speed. but im speculating, as i dont have experience with 2 speed fans. i would wire it to low speed, and if that doesnt cut it, just connect to the high speed wire instead. simple.
and if you are uncomfortable with this, the premade harnesses can be nice, though i am imagining that you will have to do some wiring anyhow to make it how you like.