![]() ![]() If it’s not, switch the two wires, turn the car off, and you ought to be good to go. If it pulls air from the front of the car, you’ll be able to feel it when the fan turns on. If you’re still unsure, wait until the car has reached operating temperature before turning on the fan. Find the wiring diagram provided by the fan manufacturer if you are unsure which wire comes out of the electric fan. The electric fan’s positive wire should be connected to one of the two red wires on your relay, while the negative wire needs to be grounded. Usually, 87 (red wire) joins to the positive wire on the electric fan, 30 (other red wire) requires fixed 12-volt power from the battery, 86 (gray/white wire) goes to the ignition switch and 85 (black wire) joins to the temperature-controlled sending unit. Look at the bottom of the relay, you’ll notice four pins and there are four numbers. It also offers low voltage control of line voltage circuits. The fan control center can be used to manage two-speed blower motors and auxiliary circuits in heating or cooling equipment.
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