If you tap in prior to the relay the switch wont be carrying much current, if you splice in at the temp sender I think it is then carrying to current of the fan and might need to be fused accordingly. Dont know, just guessing.
In my splice the switch is just running the relay, so very little current draw that is pulled off the fuse panel.
I will try to remember tomorrow to check the applicable wire to splice.
Try this link http://www.myunibody.com/forum/viewtopic.php?f=13&t=1068 It might just be what you need.Does anyone have an older model (80's) XJ with an aux. Fan bypass switch? I do not know which wire is the Signal wire on the relay that grounds the connection for the fan to turn on. I would like to splice and run a bypass switch to activate the fan whenever.
Anyone with a similar year xj with pics, wire color??
Thank you,
XJAY89..
The fan relay should be around the front left fender wall. About 1"x1"x1.5". Four wires; red, red, black, orange. Crimp a splice connector onto the orange wire with +12v and it turns on the fan.
If you have a lighted switch, one goes to +12v (fuse panel tap), one goes to above orange, the ground goes to metal screw under dash. The light will come on when switched on, or backfed when temp or a/c turns on fan.
