2KXJJEEP

Ok so i want to put a switch on the stock electric fan and was wondering if anybody can tell me the best way to do this...post pics if u have any...Thanks

nowhereman98

Do you mean a fan override switch? If you do, I am testing one now. My system overrides the factory fan relay through the ground signal from the computer. This way I can keep the fan on when the temperature falls below the factory set point. So I am going to test this a while before I can get pictures and wiring diagrams to you just to be sure it works. I am new to Cherokee forum and I don't get a chance to check it everyday so please be patience with me. I enjoy Cherokee forum. I hope I can help you guys with my 25+ years as a mechanic and 30 years off road experience.

2KXJJEEP

thanks a pic and a wiring diagram would be pretty cool ill keep a eye out for it thanks again

aquickmopar

I have it done to my 99, All I did was run a switch off the dash, Power the switch from an auxiliary power at the fuse panel and then run a wire from the switch and TAP into the green wire on the electric fan that way with the switch in the off position the fan still works when the temp gets to high and the computer tells it to come on, Or I can just flip the switch when ever I want and manually turn it on.

2KXJJEEP

thanks im going to do it like that

99 Purple XJ

I did that same way its the easiest and the best way

austinjoe13

I took the easy way out and ran 12 gauge wire from the battery to a switch inside and then to the power wire on the fan. 30a fuse at the battery and a 30a rocker fuse from radio shack. I only use it in town and when I'm towing so it works for me. The wiring and switch get warm though.

94XjSport94

https://www.cherokeeforum.com/f24/el...switch-132465/

2KXJJEEP

ok so i was going to do this and i still want to but somebody said that they did it and there ecu burned up afterwards

Westbeach4

Just did 94xjsport94's write up today. Easy and works perfect. Thanks

94XjSport94

Thanks, the only thing i did after my write up was i put in a 12 V diode from radioshack and put that in the line. Works great

Omnipotent Octopus

Is this true? Im about to do it this way so id like to know before hand.

94XjSport94

I've never heard of that... Not to discredit it just saying. Besides with a diode the current can only flow one way so i don't imagine that being possible, with a diode correctly placed in the circuit

Nor-CalJeeper

Now correct me if I'm wrong but if your running power from your own switch to the green wire, and if the fan relay WOULD kick on for any reason what so ever with it's own power source from the relay, wouldn't that create a positive to positive and fry your wiring pretty much instantly?

94XjSport94

I think it will only turn on from the relay if the switch was in the off position... However im not willing to risk it so i wouldn't do this lol. My write up basically in a nut shell says that the fan gets power from getting a completed circuit via connecting a ground.... so, when you have a wire hooked to ground on a switch with a diode in the correct order, your fan will turn on and off via the switch you installed (only when battery power is on) and when the switch is OFF the fan will run as usual with AC and the temp sensor