ok cool but im really bad with diagrams and electronics, so what would i need to do if i already have a nelson harness?
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ok cool but im really bad with diagrams and electronics, so what would i need to do if i already have a nelson harness?
ok so on a 02 pcm can i ground out pin 33 and then just add the relays. also where would i get the extra pin if i wanted to do this. thanks.
I suppose you have a truck PCM? First thing is to get the fans turned on in the PCM. Next, build your relay setup or buy one Allen's. Allen will send you the pins for the PCM. If you're going to try it yourself, I can send you some short leads with pins that you can wire into your system. If you have a Camaro/Corvette engine PCM the fans are already in there.
ok that would be cool, but when i get my fans turned on do i need to have them turn on PIN 33 to or is it already on? Also do i have to have the pcm turn the fans on at 230 for high or will it do it automatically. I looked at the diagram and i kinda understand what i have to do, so i just need another relay and another pin and just do a little rewiring right? I also i know ive said it before but i want to make sure that it will work with an 02 truck pcm. thanks.
"I felt there was no need for the fans to run high ( with 05 fans , they pull lots of air , alot more than the ls1s do ) until a max or extereme temp ( 230 degrees ) was reached and that is what the design does either the way I did it or RedHeartbeat , mine is just a Nelson harness modified"
Be sure to use the 1/4" spade terminals that are completely insulated if you make your own harness. That will protect from any possible shorts at the terminal. Most of the quick connects for relays I have purchased have too small of wiring on the pigtails to carry the load the fans will require. Nelson builds his own connections and puts whatever size wire he wants as pigtails and they can carry the load. I would say to get the Nelson harness and make changes to it to suit your needs if you don't like how it works. Most guys love it and it's simplicity. I don't know if I'd build one myself due to how easy it is to get everything you need from Nelson and his is nice and clean with all the correct connectors. I know I spent at least 4 hours doing mine plus I had to chase down all the parts. With the price of gasoline these days, why bother?
ok sorry another question. Now once i get the pcm pin 33 and 42 turned on. Do i have to have them set with different temps. like for example pin 42 with and on and off. Then have pin 33 with another set of temperatures. thanks. Also if i do have to set the temp for pin 33, what temp should i set it too? 230 or 220? stock tstat