I've redone my electric fan wiring several times. This is because when I first did it, I had no idea what I was doing. lol So I figured I'd post this up to help yall out just incase.
The fan I am using is a Taurus 3.8L electric fan. This is a very popular fan to use because it can pull some awesome cfm's. It is a two speed fan but for my truck the low speed has been all I've ever needed. The high speed draws a lot of amps, and requires some extra work to hook up.
The ignition wire is a nice Orange 12ga wire under the dash I found using a tester.
All you need is a relay (30-40amp), a thermostat controller, and a lot of 12-14ga wire and connectors.
Hayden now offers a really nice fan controller kit that would be a good purchase. It has provisions for A/C input.
relay wiring is as follows:
-30 = constant [positive (+)] power - From stud on fuse/relay box
-85 = coil ground - Grounded to fender
-86 = coil power - Coming from ignition wire under the dash The thermostat is also on this wire. the relay doesn't get the ignition signal until the t-stat sends it
-87 = switched [positive (+)] power output - Goes to fan
-87a = not used
Here's a pic of the fan:
If you look to the right you can see a bracket I made to mount it to the top of the rad.
scrap piece of metal I had was used to make the upper rad plate. You can pick one up from a few places if you want a nicer one.
here is the location of the relay, behind the fuse/relay box
Stud on the fuse/relay box used for the constant power. This has a 30a fuse on it inside the box (green fuse in photo), looks nicer than using an in-line fuse.
T-stat location, easy to get to and adjust. If you look below it, you can see where the fan is grounded to the support.
That's All Folks!
