Turned out to be a Faulty CC-M [Originally CC-M and motor-to-backplane connection questions]

rplst8OGR Forum Member DIGITAL SUBSCRIBER

Does anyone know the purpose of the connection between the motor driver output from the ACDR/DCDR and the modular TMCC/RS backplane? I’m upgrading an older loco with a DCDR to an ERR CC-M and I’m wondering if that connection is still needed.

The schematic below depicts the connection. Follow the blue and green wires from the yellow wire nuts to the connector circled in red.

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3/8/217:27 AM

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