Putting together STS-PI.
eh.motor.two.backwards(100) does nothing.
Forward works fine.
motor.one works perfect forward and backward.
Have switched motors and cables to isolate problem specifically to motor.two.backwards.
Any idea what to check? I have no soldering in project - just Explorer Hat Pro (brand new) plugged into Pi3 with cables to motors.
Have also noticed that any motor running plugged into motor.two is more noisey (but same speed) compared to when it is plugged into motor.one.