Ken:
I will add to Scott - make sure you are using the inside rail. Another way to check is too put your voltmeter into continuity, place one probe on a grounded rail and the other on the insulated rail and see if they are connected to each other.
Another thing I remember - if the machine ever flutters (point rails going back and forth) check the rail pins. This is particularly true for Ross turnouts. A pin on a ground rail will come get too close to a pin for a power rail.
Ken - nothing to do with you. This is about the 6th time I have relearned this lesson. If something goes wrong disconnect everything associated with it and start over again one wire at time.
