Wiring Diagram Relay Fan. In this hvac training video i show how the fan switching relay works and how to troubleshoot the coil and switching terminal contacts. Ground completes circuit 87.
As you can see from the diagrams above and below its really a simple circuit that not only provides the proper connections to control the cooling fans but unlike the switch under the dash method you wont ever have to worry about forgetting to turn the fans on. Output when activated. If not the arrangement will not function as it ought to be.
Wiring diagram the coil will be energized as the current flows through terminals 85 and 86 labeled as relay and relay respectively.
Page 2 standard relay pins 30. Radiator fan switch wiring diagram. Signal switched 12v 86. I take the relay apar.