Fan Wiring (Universal)
Posted by Patrick Muschamp on 08 11 2014 04:06 PM
1. Vehicles with existing electrical fans, we highly suggest cutting off the plug on the OEM fans that you are removing from the vehicle. This will prevent from damaging the vehicle's electrical body harness. The first step is to determine how many wires are going to each fan.
a. 2 wires - One is positive, the other is negative. The positive wire will need to be spliced into the blue Mishimoto wire. The negative will attach to the black Mishimoto wire.
b. 3 wires - Usually, two are positive, with the 3rd being negative. Twist the two positive wires together and connect them to the blue Mishimoto wire. The negative will then go to the black Mishimoto wire.
c. 4 wires - Two are positive and two are negative. Twist the two positive wires together and connect them to the blue Mishimoto wire. Twist the two negative wires together and connect them to the black Mishimoto wire.
2. Vehicles converting from a mechanical/clutch fan to an electrical fan set up, we highly suggest purchasing a thermostatic fan controller in order to turn the fans on and off based on a temperature. This is not necessary. Below are ways to wire your fan into your vehicle.
a. Direct from an ignition power source. A customer is able to tap into a source that obtains power when the engine is on. This will force the fan to run while the engine is running, much like the original clutch fan. See attachments for additional information on this.
b. From a switch. A customer is able to wire the fan to a switch off the battery (or another source) to manually turn the fan on and off. The only downside to this is that the driver will need to pay great attention to the operating temperature to ensure that the vehicle does not start to overheat.
c. Purchasing a Mishimoto Adjustable Fan Controller Kit. A customer is able to wire in a fan controller that will turn fans on and off based on a temperature set by the customer.
3. Wiring fans as a pusher (reverse). A fan's job is to simulate air moving through the engine bay when the car is not physically moving. Commonly, fans are considered "pullers" where they are mounted onto the back of the radiator pulling fresh air into the radiator. Some customers will need to install a fan onto the front of the radiator due to clearances in the engine bay. For wiring, the fan must become a pusher rather than a puller. This will allow for fresh air to be pushed into the radiator when the vehicle is not moving.
a. Wiring for a pusher is as easy as switching the polarity of wiring. The customer will need to attach the positive to the black Mishimoto wire, and the negative to the black Mishimoto wire. This will force the fan to spin backward, pushing air. NOTE: This can only be performed on straight blade fans.
1. Wiring a fan to turn on with vehicle (Section 2a)
2. Which fuse to use when wiring a fan to turn on with vehicle (Section 2a)