Electric Cooling Fan Control Wiring Diagram 30: constant 12v, unswitched 85: signal (switched 12v) 86: ground (completes circuit) 87: consumer (fan) 12v 87b: extra consumer (same as 87) 12v switched wire. may be green wire at a c clutch. note: or in an ’84 to ‘89 240 you may use the a c power ‘on’ wire: red white wire at ac switch microswitch in dash. With dual cooling fans, there are two methods for wiring up the relay kit. this is based on the draw from the fans, if the fans are larger and draw more than 15 amps each, it's recommended to install a second relay kit as shown below. for smaller fans, both fans can be connected to a single relay as shown above, and the proper fuse should be.
Electric Fan Wiring Diagram 87 (red wire) connects to the positive wire on the electric fan. 30 (other red wire) needs constant 12 volt power from the battery. 86 (gray white wire) goes to the ignition switch. Here are some tips to help you with the wiring process: 1. use the correct wire gauge: when wiring an electric fan, it is crucial to use the correct wire gauge. the wire gauge should be suitable for the amperage rating of the fan. using a wire that is too thin can cause overheating and potentially start a fire. 2. First, check if the fan is properly connected to power. make sure the wiring connections are secure and not loose. additionally, verify that the power source is providing sufficient voltage to the fan. if everything seems fine, you may need to check the fan motor or the fan control module for any malfunctions. 2. How to wire dual electric cooling fans.
Wiring Diagram Electric Cooling Fan First, check if the fan is properly connected to power. make sure the wiring connections are secure and not loose. additionally, verify that the power source is providing sufficient voltage to the fan. if everything seems fine, you may need to check the fan motor or the fan control module for any malfunctions. 2. How to wire dual electric cooling fans. Wire the relay to the power source: connect the relay’s positive wire to the power source, usually the positive terminal of the battery. connect the relay’s negative wire to a suitable ground connection. test the fan: after completing the wiring process, test the electric cooling fan to ensure proper functionality. Or a single relay could be used to control both fans. the cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. it uses a 40 amp electric relay and electric fan sensor. start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay (tab 87).
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