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This post will show you how to bypass the PCB
http://www.steelsoldiers.com/showthread.php?113634-Ever-see-inside-the-Protective-Control-Box&p=1557388&viewfull=1#post1557388
Also I would suggest reading the whole thread as there is a lot of useful info in there.
Could be a bad ignition switch. Have you tested it with a DVM (Digital Volt Meter) to verify that power is present to the switch and if power is leaving the switch when moved to the other positions?