[DonRotolo]

OK, so here was the solution we went with:

Measured the voltage drop from the battery + cable end to the + terminal on the power distribution board. I am estimating we had about 5 mV per amp, but all we needed were relative readings, so that was more than sensitive enough (our DVM could display 0.1 mV).

The problem we needed to solve - one breaker was popping - turned out to be a sensitive breaker. Many thanks for team 1732's advice and assistance on Wednesday evening as we worked the checklist.

For what its worth: The right side measured "43" units, the left side measured "38" units, both at full speed off the ground. We attributed the difference to a tight chain; we didn't change it, added some lube, and went to the field like that. We did see some breakers popping on occasion, but it wasn't a problem.