Engine Cooling Fan Wiring Diagram. Relays shown in these diagrams can provide options for useful. Check that the ac switch is off.
I added the arrows to indicate current flow from positive to negative. The engine operating temperature will still be governed by the coolant thermostat. The electrical diagrams lists 3 relays.
The supplied diagram below using dual relays with a single temp sensor is both the most reliable and easiest method weve found for wiring dual fans.
The supplied diagram below using dual relays with a single temp sensor is both the most reliable and easiest method weve found for wiring dual fans. Single fan wiring diagram fuse multiple fan wiring diagram causes poor air flow through radiator poor engine ventilation insufficient radiator en ine idle circuit too lean en ine timin too advanced poor radiator en ine combination defective or stuck thermostat solutions install electric fan or duct air into engine com artment. The relay isolates the high amp load of the fan circuit from the switching circuit. Optionally a single high current relay could be used to control both fans.