There are several ways that a dual fan can be wired.
Dual electric fan relay wiring diagram.
The supplied diagram is both the most reliable and easiest method i ve found.
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.
Blue wire black wire to chassis ground diagram 1 kit contents qty.
87 red wire connects to the positive wire on the electric fan.
There are several ways that a dual fan can be wired.
Primary cooling fan dual fans with dual relays single speed on off using ground switched devices only for primary activation using dual relays for two fans is not required.
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For example dual thermostat switches or dual relays could be used to control each fan separately.
Cooling fan relay wiring diagram how to wire a fan relay hvac in dual fan relay wiring diagram image size 730 x 656 px and to view image details please click the image.
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.
Here is a picture gallery about dual fan relay wiring diagram complete with the description of the image please find the image you need.
30 other red wire needs constant 12 volt power from the battery.
Relay 2 electric fan 1 electric fan 2 87 87a 30 86 85 orange.
And if a relay fails you will still have one fan running.
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Connect yellow and grey wires to ground.
You could use one relay.
The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.
Wiring dual cooling fans.
Or a single relay could be used to control both fans.
With dual cooling fans there are two methods for wiring up the relay kit.
However two relays will divide the load.
Or a single relay could be used to control both fans.
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It uses our 40 amp electric relay kit part number 91064044.
The fan will turn on when the a c compressor activates.
For example dual thermostat switches or dual relays could be used to control each fan separately.
It uses a 40 amp electric relay and electric fan sensor.
The orange wire from the a c relay goes to the 12 volt of the a c compressor clutch wire.
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