PWM cooling fan(s) control using ECM

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Originally Posted by dhutton

When you use the DCC fan controller it is completely standalone and not connected to the ECM. The DCC instructions tell you how to interface to the trinary switch. It’s pretty straightforward. The fans connect to the DCC controller. The ECM fan relays are not used.

Don

Got it, thank you. What I didn’t realize was that the DCC and the GMPP ECM do not hook up together. Are there any potential issues if the ECM does not know what the fans are doing? And then do you just abandon the GMPP fan wire?