Working on a Bally Old Chicago. Ball Count Unit will not advance and neither will Player Unit. Have checked and cleaned EB relay and Ball Index relay switches. Additionally, in game only, the shoot again on playfield and the ball 4 in backglass lights are both lit dimly. If you actually earn an EB, the ball 4 light goes out and the shoot again lights up fully. Having a buddy more familiar with more EM experience help, but we're a bit frustrated and stumped at this point. Any pointers would be greatly appreciated. We do have the full schematic in hand.

Nothing. It isn't energized when the light issues are happening.

Manual operation works fine. Yes starts on player one ball one. After scoring and draining most times it stays on player one ball one. Some times it goes through the players to player four ball one but never advances past ball one. This is all on a single player game. Not multi player.

A quick adjustment of the switch stacks on the motor at 3a and 4b has fixed this issue. Thanks, so much. Now for that light issue

Fixed that one also. Was a wiring mess up on our part thanks. Last issue seems to be the bonus saucer won't register. Switch has continuity back to the bonus unit. We're looking at the schematic for next steps.

We decided to call it a night. I wiggled the wiring coming off the bonus count disc and the old Chicago bonus lights started lighting up. We had figured they were bad bulbs. I'll give this mech some attention this week. Thanks so much for your pointers. Almost done. We had to track and reattach every wire from the head to the backbox. A previous owner at some point cut the whole harness rather than disconnect the Jones plugs. And at some point after that someone else tried to fix it. I wasn't trusting that work. In that process I messed the 2 orange red wires. That's what caused the shoot again and ball 4 light issue.
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Thanks. The game is cosmetically gorgeous so I felt it was worth the effort. It's also a very fun EM.

Got back to this tonight. Score motor switch was the culprit in the saucer issue. Fixed a broken solder connection on the back of the bakelite wheel while cleaning the Bonus Count Unit. This made all the OLD CHICAGO lights work properly. Seems to be fully functioning now. Fingers crossed. Thanks much.

Figured I'd bump my original thread on this. Bonus is doubled on balls 3 and 5. This feature is working, however, the double bonus insert only lights on ball 5, even though it gives double bonus on ball 3, as well. I've seen other videos of the game being played and it should light on ball 3 as well. Weird one.

Thanks for the tip on where to look. I know my friend and I cleaned up the bonus unit and another stepper. I believe the player unit. I'll look at the ball count unit next. It definitely goes through all balls in a game properly, but I see where maybe the finger or rivet that controls that light on ball 3 could be an issue.

Followed that path and found a jumper between the rivets for balls 3 and 5 has been cut at some point. Pic attached. Wanted to be sure I can just jumper this back it if it should be a diode instead.

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Since the schematic doesn't show any diode or anything, I jumpered it and all is well. I need to play several 4 player games to get it broken back in from being dormant all those years.

Noticed an issue while playing and then tested with glass off. So, if you have built up between 1 and 5 thousand in bonus, the bonus collect hole scores the bonus and ejects fine. If you have 6 or more thousand, it will just sit there in the hole and not register, score or eject. The unit is clean and counts bonus fine, so I'm kinda baffled. This part of the schematic has me thinking my fingers are off by one position, but why would it count fine? Including a pic of my bonus unit at reset/zero position and a section of schematic, I'm questioning.

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I may be reading it wrong. I thought the 5000 bonus hole relay was the saucer at the top of the playfield and not the collect saucer. Hmmm. That saucer becomes worth 5000 only when all letters are lit (full 10K bonus).

OK, looked at that relay and cleaned it. Looked fine and seemed adjusted properly. Did some manual testing. With the bonus at 5K, manually activating that relay scores 5K and does not trip the eject sequence. At 6K, it scores 6K and triggers the eject. At 7K, it scores 6K and ejects. 8K scores correctly and ejects, 9K only scores 8K and ejects and 10K scores 10K and ejects. I'm worried my fingers are off a position but not sure.

Found an old thread with the same issue, but never posted a resolution:

https://pinside.com/pinball/forum/topic/old-chicago-wont-kick-out-bonus-saucer-league-tonight

Also, now when I manually activate the 5000 bonus hole relay, it gives only the point above 5000. If I activate the regular bonus hole relay, it also pulls in the 5000 relay and does the whole sequence properly. This is weird.

Got this one solved. Pulled the playfield to get a real good look at those relays. They looked fine. While it was out, I cleaned the jones plugs and when I reinstalled it, all is well. It was driving me nuts, since all the pieces of this chain seemed fine on their own. Love this game.