If you manually engage the 100 point relay what happens?

1) Does the 100 Point relay get activated when it should?
2) Does adding 10 to 90 activate the 100 Point relay?
3) What happens if you manually activate the 100 Point relay?

Does your machine have a 2nd player relay in the backbox? This relay is full of make/break switches that transfer power from 1st player score reels to 2nd player score reels. Check for a switch that all 3 blades are touching. Adjust wrong touching blade.

He said it won't score on either player which points more to the 100 point relay. That second player relay would cause scoring on both players. I unfortunately have experience with Bally two players doing that

As its been said, the 100 point relay can be manually activated in a game, see what happens. Not sure where it is, look for labels. Or better yet, score single pints or other points and find where the relays are activating, the 100 point relay will be next to the 10's, etc.