My factory wiring for my dual electric fans was FUBAR so I decided to wire in a switch to turn the fans on when I want. Well got the switch wired in positive wire from the fans going to the switch, and the ground wire going to the body. I have the power for the switch going to the battery and the ground to a prior ground under the dash. Tried it and at first it worked great, no visible problems. Then I go to switch it on again and it turned on the off really quick and it hasnt worked since. I originally thought that the switch just blew so I bought another one and that one does not work also. My question is did I mess something up? Blow something? What can I do to get my fans to work. I live in Florida and the car does not fair too well if I hit traffic, so I need these fans working or the car is basically not drivable.

Did you bypass the fan relay or did you splice onto the manual fan wire from the relay?

We bypassed the fan relay and just wired straight to the fans.

If you wired them straight, I would really suggest putting a fuse in the line. Also I would use one switch per fan because those toggles get really hot. Try another switch, and make sure you ground is good and that your wireing is all in good condition.

Sorry, just read that you did try another switch .

Hmm, yeah, I would definately have a good look at the ground. Get a wire brush and some sandpaper and really clean the area around the ground.

Also, 91wt bring up a good point about using one switch per fan. I would definately do this if you are using a 20amp or lower switch. I bought a 30amp rated switch and run both fans off this switch with no heat build up at all. The fans draw a ton of amps so using the 15-20amp switches is not a good idea.

Worse case scenario is that you burned out the fan motors by not using an inline fuse. Doubtful although it is a possibility.

Well bought a 30 amp switch and figure that if this doesnt work I am gonna buy 2, 30 amp switches and run a fan through each. I also bought a inline fuse and will be running a 30a fuse. Hopefully this works, also I dont see a problem with the ground as it worked before, I am going to test the first switch at work tomorrow. It was a 20 amp, the fuse I bought to replace it was a 15 amp, I honestly wasnt even paying attention to the amp rating.

I'll keep my fingers crossed. Also, what gauge wire are you using for the project?

I used 16 guage wire.

Ok, if you take the hot wire straight from the fan motor and touch it to the positive on the battery, does it work? Try that. If it works, you know the motors are good and are excepting the power. Also, make sure the connection you orignally made at the battery is completely tight and in check.