I do not no about the 1620, but I had the same problem on a 3000 series. The ignition switch had a separate ground where some how the ground wire had come off the the tab on the switch. Hooked the ground back up and the PTO worked fine. Not saying that is your problem, but might be worth looking into.
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Don B, USAF 1962-1968, Ft. Wayne, IN
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