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A handy tip when DCCing a DMU trailer without a motor is to use a decoder with bipolar outputs like the Lenz LF100XF where you can just disconnect the existing lighting wires from the pickups and connect them to the white and yellow wires, and connect the red and black wires from the decoder to the track pickups. Reprogram from the defaults if you want independant switching of the lights on different functions. With the Lenz LF100XF you still have the green, purple and blue wires for additional cabin lighting and stuff.
