Thanks, I will attempt that later today. I am yet again impressed by all the Pinsider experts who have pursued this problem.

I did find this in my musings: If I block the W-G wire hold switch on the 3000 relay there are big & good changes. Going through the open gate resets the drop target and gives 3,000 points as it should. Going through the open gate with the special light lit resets the drop target, scores 3,000 points, and adds one add-a-ball as it should. NO extra scoring and no endless add-a-balls.

I do notice that going through the gate in either case does advance advances the 'X' value one space, and I don't think that should happen.

If I can't find the short at the Jones plugs with the method you just suggested, I can easily live with the work around I found. The ball rarely makes it through the gate so an extra 'X' value once in a while is a good trade off to either leaving the upper trough switch blocked as it was by the repairman (never scoring 3,000 points or an add-a-ball) or leaving the upper trough switch active and having an unplayable machine that adds endless points and add-a-balls.

Sound good? And thanks again for sticking with me. Henry