I am building a custom engine harness for my project car, and I am trying to wire up the fan switch (the big fat switch on the back of the block, by the Oil Filter), but I can't seem to figure it out. Do they connect directly to the ECU via the shock tower plugs?

Any help would be appreciated.

PS building a wiring harness sucks. I will never do this again lol

 

Shew I feal for you man. I tried working on doing the same thing for about 3 months...never had any luck finding out how to hook it up. So now I am just running it to my own swith in my dash. ha

 

it's not that hard, especially with your own harness. you need 3 things: the temp switch on the motor, a relay (wired to ignition on), and the fan. if you search on here there are wiring diagrams that help explain it