I'm working on a Stern Stampede EM machine. I've gotten most of it working as it should, but can not get the ball count to increment. I have traced back every switch in the chain, and it seems the score motor isn't turning from the out hole relay. The score motor will move slightly, but won't move forward even one position. Occasionally it will work. Obviously something needs adjusting, but I can't figure out what. The score motor works fine when it's triggered elsewhere. So it's not the motor run switch. Any insight is greatly appreciated!