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Originally Posted by Bduggan04
I would expect behavior like that from a short in the wiring. You could be back-feeding current into the speed controller for the unconnected motor. I have never seen a current like that induced in a wire on a FIRST robot, so before you chase the rabbit with the emf meter, check your wiring. Using the ohm checking capability of a multimeter, check for continuity where there shouldn't be continuity (i.e. motor wires on opposite sides of the drivetrain)
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Backfeed was prevented, we tested the robot while it was off the ground so the left motors were not spinning at all and the fuses to their Victors were removed leaving only one possible power source... we think.