Even though the schematic is with a reversing switch (252 loco), just trace the wire and all goes to the collector plate along and the collector plate goes to one of the armature brushes. You do not have to connect to the collector plate but rather connect to the armature brush plate using the screw connection. Use the ohm meter to buzz out the continuity from the brush plate to the collector plate to get the right brush screw. If you use solid wire it may be easier. I always use super flex stranded wire at this point so that when I take the cab on and off for servicing the sire will not be that/break brittle.
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