And if a relay fails you will still have one fan running.
Dual electric fan relay wiring diagram.
The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.
There are several ways that a dual fan can be wired.
The supplied diagram is both the most reliable and easiest method i ve found.
However two relays will divide the load.
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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.
Or a single relay could be used to control both fans.
The fan will turn on when the a c compressor activates.
87 red wire connects to the positive wire on the electric fan.
Or a single relay could be used to control both fans.
You could use one relay.
For example dual thermostat switches or dual relays could be used to control each fan separately.
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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.
It uses our 40 amp electric relay kit part number 91064044.
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There are several ways that a dual fan can be wired.
The orange wire from the a c relay goes to the 12 volt of the a c compressor clutch wire.
Connect the red wire to the sending unit wire of the original fan relay harness.
Relay 2 electric fan 1 electric fan 2 87 87a 30 86 85 orange.
Connect yellow and grey wires to ground.
It uses a 40 amp electric relay and electric fan sensor.
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86 gray white wire goes to the ignition switch.
For example dual thermostat switches or dual relays could be used to control each fan separately.
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.
Description 2 relay wire harness 2 40 60 amp relay tools needed wire stripper crimping tool important each relay will control up to two different fans with a combined maximum draw of 25 continuous amps.
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.
With dual cooling fans there are two methods for wiring up the relay kit.
Here is a picture gallery about dual fan relay wiring diagram complete with the description of the image please find the image you need.
