I have a Nelson harness but Im mounting my LS1 fans tonight and my tuner wont be in town until the weekend so how do I just wire up a flip switch to run the fans for now? I just want a generic on/off type of thing temporarely. I need to know ASAP!

thanks guys!
Clayton

 

Easiest way I can think of is to go ahead and wire it up with the nelson harness and inline with the wire that goes to the PCM (or just don't hook that wire to the pcm yet) hook up a switch that goes to the harness on one side and a ground on the other. If I remember right that wire is controlled by a ground signal from the pcm so when the switch is on that wire will be grounded and the fans will come on.

Been a while since I looked at that stuff though so hopefully someone else will verify this.

 

If thats the way it is to be hooked up then Yes, thats right... The wire that goes to the PCM should be on a switch that goes to ground NOT +12V!


IF it has a wire that is to be connected to the AC compressor,,, that one should be connected to a switch that has +12v to it..