I can get you some pics of the internals. Hopefully you have a cir diagram...

Meanwhile I anotated section of the cir diagram to help explain the base logic.

Good luck with the game.

72GSscoringandsettingBases.JPG

72GSbaseresets.JPG

72GScascade.JPG

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one more

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yea, there is anorther fix for ball eject, an extra finger in the hole to make sure the ball sits in the cradle properly...

you need a circuit diagram! I'll check mine

4grandslam-853.jpg

Frax, you may be right about that....here's a pic of 4 GrandSlams I arranged for at the 2013 TPF. Why, Ive even killed one off that was in serious shape. Yes that makes 5

4grandslam.jpg

The triple relay...there is a rollover for a triple, check the gap.

Is your hit unit working? Lower right on bottom board, it will advance 5 (4?) steps any time there is a base play? One of the things it does is release the triple, double, single relays after advancing the runners. you can actuate it by hand. there is a contact that rides on the outside of the bakalite wheel that opens at the neutral position, otherwise keeps the score motor running...

Ken

Yea, look at the contact that rides on the outside of the wheel, NO at the neutral position, NC when the wheel starts. five advances to the next neutral.

you said your triple relay was locked on...

If its the scoring relay...then the contact that actually drives the reel solinoid is dirty. Clean and gap the contacts on the relay, "M" relay? untill the reel turns and open the release contact the relay locks on.

you have a dirty or mis-gapped contact on the "locked on" relay, that drives the reel. with a small screwdriver you can short each pair of contacts on the relay and you'll discover which set drives the relay. once the reel fires it opens a contact that drops the relay.

Ok, so its still a startup issue... Take alligator clips and jumper the zero position switch on each reel, dont forget the run reels as well. If you had the circuit diagram you could trace the daisy chain wire that runs thru all the reels.
I'll get you a scan..