Atom G4+
ave Coolant fans triggered by Auxiliary Output #2 ( Pin #20) . Works fine controlled by ECU.
Would like to add an Manual Override switch which would simply ground the #85 Terminal on the Fan Control Relay. As this is also connected to Pin #20 on ECU, are there any special precautions that have to be made. Such as adding a Diode to wiring to ECU to prevent any type of Feedback.