I just put in a new p.s. board and afterwards found this single wire loose, coming up from the cabinet to the backbox. Has a screw lug on one end and the disconnect is labeled 'A12 J5' and 'A12 P5'. I already ground modded the game years ago and I attached all the ground wires to the new board's ground just like I had with the old one but now I'm not sure if I missed this one or if it was disconnected before and I hadn't noticed, but the game works great just as before other than a slight brightness strobing in the displays I'm still addressing (existed before and after the new board). Can anybody look in their game and identify where this wire attaches? Ground wire to power supply board? I don't want to assume that and blow it up. Thanks!

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Oh crap, never mind, it's the ground wire that attaches to the lock mount in the head. Been dangling there for who knows how long!