wire a test switch in jamma

get something like a small pushbutton, like this midway cocktail start button -
PB903.jpg
, and wire one side to test, and the other to your ground loop.

what i did on my multi williams was using the advance/test switches that are on the williams coin door, i just wired one to test and one to service.
 
1 Common
Before pressing button....
2 Normally Open
3 Normally Closed
 
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