Should I (can I) send battery power to one pole of the motor through the chassis?

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I would like to set up an Athearn SW for battery power and RC. My understanding is that on this engine track power is transmitted to the bottom pole of the motor through the chassis. To install the battery, can I – and should I – send power to the bottom pole of the motor by connecting one wire of the battery to the chassis?

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Best to isolate the motor. It’s held in with a rubber plug. Carefully pop it out, and then bend/remove the tab that sticks out of the bottom of the motor. Also, I’d put a piece of electrical tape or thin plastic or card over the spot on the frame where the tab contacted the frame, just to be sure.

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