The tape appears to have perhaps two functions - to prevent the chafing of the wires on the light bracket, and to provide a measure of strain relief on the motor wires. If you watch the motor pivot with the shell off on the O-31 curves this diesel was designed for, it becomes evident that keeping the wires tethered closer to the brushplate cuts down on the fatigue to the connections at the brushes and the field.
Jerry Williams did something similar by using a rubber band to cinch the motor wires down & around the can/enclosure to keep the wires from flexing at the motor solder tabs.
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