Coolant Fan Switch Wiring Diagram. If the motor tests ok check the cooling fan thermo switch located at the bottom of the radiator on the drivers side. A wiring diagram usually gives instruction just about the relative incline and pact of devices and terminals on the devices to.
Suggested electric fan wiring diagrams converting a 12 volt switch into a ground switch these diagrams show the use of relays on off sensors on off switches and on off fan controllers. Model specific testing requires that the wiring diagrams for the model in question be bmw auxiliary fan temperature radiator fan switch. Tags for this thread.
Simplest way is to piggyback off the two wires on the radiator thermo switch big brass bung with two wires in the top of the radiator bring them both back to the dash and connect to the existong fan switch.
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. Check that the cooling fan stops. Allowing you to override your controller. This means when you flick the dash switch you complete the circuit which energises the relay and allows the 12v live to go to the fan.