I always place a mark on each flywheel and test the motors with a 9v battery with the wheels off the ground. Then I wire the motors together and test again with a 9v battery to see if both flywheels turn the same direction ( off the ground) Then I test the motors on a 3 foot section of track to see if the engine runs right. This way I don't screw up the ERR board. If a 9v battery will not turn the motors I use a HO (DC) transformer but most of the time the 9v works.
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