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In depth idiot
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That the model runs indicates that you are in with a shout, the motor runs when it gets power; it's finding out where the intermittent loss of power to the motor is occurring.

I would start on the test bench, and find out if the motor runs reliably when given a DC supply direct to the motor brushes, and if that's good then work systematically backwards from one brush through the circuit to the wheels from which pick up is taken for that side; and then repeat for the other side, until you hit upon any loss of conduction. (There could be more than one...)

Nothing more specific in the way of advice is possible, because while conversion might mean made equivalent to a factory 2 rail version using H-D parts, it may also be a complete home brew project, and we cannot see what you have got.
 
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