mikalcarbine Posted October 10, 2013 Report Share Posted October 10, 2013 I have an electric automotive fan being controller by a DCCONTROL FK-55 MOSFET PWM controller. It basically controls the fan via a temperature probe and a PWM signal based on the temperature of my radiator. I'd like to install a relay so the fan only turns on when the ignition is on but I'd also like full control (on, off, auto) of the fan. Luckily the controller has an input to do this, 12V = ON, open = AUTO and ground = OFF to the input. While speaking with my buddy he suggested parallel relays for diversity and mentioned a projection diode to protect the relay coil from surges, here is a basic circuit I createI have a SP3T switch with LEDs that I wish to wire up. The LED will light when the fan is on. I'm not sure if I need another relay for this or if the PWM signal from the controller will be enough. What does everyone think of this circuit? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted October 13, 2013 Report Share Posted October 13, 2013 The PWM from the controller should be enough to light a small LED but its brightness will vary, depending on the speed of the motor. Quote Link to comment Share on other sites More sharing options...
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