Get the manual/schematics.
Start where power originates on the rectifier board.
Follow the power path with your DMM.
You'll find it.
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Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info