Hayden Electric Fan Controller Wiring Diagram - Ford Bronco EEC-IV Pin 57

This document is a simple hand-drawn wiring diagram showing how to wire a Hayden electric fan controller in a vehicle, uploaded to a 1994 Ford Bronco gallery. It shows an 80A continuous duty solenoid feeding switched 12v to the Hayden controller, which drives the electric fan. The controller's temperature probe is placed in the lower radiator hose ('probe in lower rad hose'). Key-on power for the controller is taken from EEC IV (pin 57). Constant 12v runs from the battery to the fuse box. A ground wire, annotated '#4?? all the way to battery' (suggesting 4-gauge cable), runs from the solenoid/fan circuit back to the battery, and ground symbols are shown at both the battery and the controller. Wire colors in the drawing are schematic (green for grounds/heavy cable, red for power feeds, blue label for switched 12v) rather than actual wire colors. A reader can learn the basic power, ground, trigger, and probe connections needed to install a Hayden adjustable fan controller with a relay/solenoid on a Ford EEC-IV equipped vehicle. No part numbers, fuse ratings (other than the 80A solenoid), or model years are stated in the document itself.