Wiring diagram I made up to manually control the electric fans from the cabin. SW1 controls FAN1, SW2 controls FAN2 and SW3 is the manual override. In all cases, the switches contain LEDs that light up and because I wanted the LEDs to light up when the fans were being manually controlled, everything is wired in reverse (i.e. SW1 is in the OFF position when Relay1 is in the ON position and visa versa).