You can get the current for the thermostat at a switched 12v that way it only works when the car is on, and the proper temperature. Disconnect the radiator fan 2P connector. Get the wire situated and know which wire is ground and which wire is power! As above, its so my car can cool off after the ignition is turned off. Get a 30 amp Bosch relay and a toggle switch and 2 fuse holders. and off at 175°F. When the wire touches the positive terminal of the battery, the fan should come on. After this is all finished, connect the black (negative) wire back on to your battery. Where do I hook this wire to thr ground? Turn the ignition switch ON (II), then set the A/C button and fan control dial ON. Now lets get the power wire in place. A lot of people are now fitting electric fans to their kit cars, often because they have had to relocate the radiator away from the normal viscous fan. I have a FI tech injection it says hook the fan wire to the ground. The black wire that comes attached to the fan controller attaches to a good ground. Fuse tap for wiring electric fans for radiator The relays (each) have 4 connections. The other two wires on the relay are the meat and potatoes of the system, with the yellow wire connecting to the battery along with the supplied fuse mounted within 12 inches of the battery. Clicking this will make more experts see the question and we will remind you when it gets answered. He also has several years experience as an outside plant engineer and planner with AT&T. it comes with 3 wires. on Introduction. Step 1 - Wiring. Share it with us! Use the cable ties to hold all your wires in place. You will receive a link and will create a new password via email. 2 and body ground. Print this page; Share this page × Ad. I installed relay inline. 1 Answer. First off you're gonna need a car. Now turn on the switch! (Please call for fan shroud suggestions). 2 years ago the fan often wants to stay on then i turn the ignition off but when i take the key out the fan stops. A toggle switch can be wired into the system to manually override the cycling of the fan. Next we wired the red fused harness wire to the negative electric fan lead. Dual electric fans could be the solution to your cooling issues. goes to the +12 volt of the A/C compressor clutch wire. Measure the voltage between the radiator fan 2P connector terminal No. 2 years ago. The Chevelle has 6 inches of clearance between the radiator and the water pump and 41/2 inches to the upper radiator hose; any fan up to 41/2 inches in depth will fit. Step-by-step we show you how to get it done. Start with taking both of the positive wires from the fans and run it to the yellow wires on each relay. Now take that blue wire and tap into the red wire (after the fuse) and tape it up! 1st relay turns on fan when temp sensor is activated battery 86 30 87 85 12v switched wire to green wire at a/c clutch. I'd like to do as described here, but with the relay, and I would like to have my cooling fan turn on at 160, or 180 degrees in the summer and a higher temperature in the winter. This will be the big red wire that is connected to your ignition and sometimes even the red (positive) wire to your battery. The ignition source must be a steady positive supply of 12 or 24V DC. 4 years ago. This wiring harness is where you will concentrate your efforts. We will be using a butt connection to fuse these together. Disconnect the jumper wire. Then ground a wire to connect to the switch and you’re done. I have a 10a 6 prong toggle and plenty of wire. Currently i'm using a switch to turn the fan on. William Kinsey lives in Concord, N.C. So now we have a wire that goes through the engine bay to the cabin of your car! Blue/red was 12v blue/black ground. For instance the blue is our ground wire and the black is power wire. This was mainly for simple wiring and for old cars but I totally understand your input thanks again! Now easily tape the wires and butt connection to hold it in place. Want Answer 1. We show you how to custom wire your cooling fan, headlights, fuel pumps and voltmeters. Lost your password? The fan can also be turned off manually when cruising to extend the life of the fan. n. 17. But yeah I suggest a fan control of some type. There are a number of problems that arise, 1st, what do we use to switch the fan? Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. Step 1 Install the inside toggle switch where convenient. email@example.com. This heat would otherwise destroy the engine if allowed to remain. Then Larger gauge blue w/red and blue/black went to the fan. 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