Electric Fan Relay Switch Wiring Diagram

Best relay wiring diagram 5 pin bosch endearing enchanting blurts. Connecting a single cooling fan is a rather straightforward system it relies on a separate temperature sender to switch the fan on or you can utilize the cooling fan output if youve installed an aftermarket efi conversion. If there is a middle 87b pin it will have power whenever there is power to the 87 whenever relay is activated.

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For example dual thermostat switches or dual relays could be used to control each fan separately.

Electric fan relay switch wiring diagram. Best bosch relay wiring diagram 5 pole electrical outlet symbol 2018. Auto electric cooling fan wiring part 2 wiring the relays duration. This is the most common relay used for fog lights or other simple circuits. It uses a 40 amp electric relay and electric fan sensor.

This relay will be identified as having a middle 87b spade or no middle spade at all. Assortment of 12 volt relay wiring diagram. 87 red wire connects to the positive wire on the electric fan. 85 black wire.

Wiring a single cooling fan. The cooling fan wiring diagram below is what weve found to be the simplest and most reliable method. Chris craft 24755 views. Or a single relay could be used to control both fans.

30 other red wire needs constant 12 volt power from the battery. Click on the image to enlarge and then save it to your computer by right clicking on the image. 86 graywhite wire goes to the ignition switch. Single pole single throw spst.