I just started running all the wires for my electric fan,and have a quetion i need a bit of help with as electrical is an area i dont have alot of knowlege of.I have everything hooked up except for 1 wire,it has to be connected to a 12 volt switched wire.The problem is i am not sure what wire under the hood,i can safely tap into that is switched,that wont mess anything up if i tap into it.Any suggestions would help alot.

 

To be certain it would be nice to know year of your car and what fan kit you have.
Assuming you have a relay switched circuit, you could hook the switched 12v wire to a number of places under the hood. The leasat likely spot to hook into with out causing any issues would be the wiper park wire. It is only live when the key is on. Use a test light to locate it, Check for power at the wiper motor with key on, wipers off.

 

I personally wouldn't tap into anything under the hood. I'd take it inside and hook it to one of the 1/4" spade terminals on the fuse block. Use a tester to determine which one is only hot when the key is on, and plug it to that fuse terminal.

 

Yep, this is the correct way to do it.
And the way mine is done.

 

Well shortly after posting this yesterday,i went out to try and figure it out,and that is what i ended up doing was running it into the fuse box.This was one of those times where trying to think about it before looking at it definitely did not do me any good haha,once i got out there and started looking i had it hooked up in just a few minutes,so much for trying to think things out haha.

 

I've had cars that have a few extras plugged into the fuse block, and had to make room for more items, even though loads weren't high. I found some plug on spade connectors that plug to a single spade and give two places to plug other accessories. Bought a box of them, and they sure come in handy.

 

Seriously consider wiring the fan up the right way, using a relay. With a relay, your heavy load wire (that drives the fan) comes directly from the battery using an in-line fuse. And the light load (that trips the relay) goes through the switch. You get a good clean full power source for the fan that way, without putting an extra load on the inside car wiring.

 

from the sound of it, I thought he was wiring it with a relay, since he said he had all the wiring connected and just needed a switched source. I assumed that was to power the relay.

 

He never said if a relay was being used or not. B.M., if you are using a relay, disregard my warning. If you didn't use a relay, then re-regard it.

 

Yeah,there are actually 3 relays in the wiring harness that i got with the fan.It is a taurus fan,and the guy i got it from sold me a new hollister wiring harness for this fan.It has 3 relays and 2 fuses then the wiring for 2 temp sensors,1 for low speed and 1 for high speed as the taurus fan is a 2 speed fan,then the wire that goes to the battery,the wires for high,low,and ground on the fan,and then the wire that runs from a switched source.I had all the other wiring figured out and hooked up pretty quick,just wasn't sure right away on that swiched wire,but after looking found an open spot in the fuse box so it's all good to go now.