Thank you guys for your help! I was able to get all the lights to working and player select working now! As I select players the lights light up and the score boxes light up. I ended up cleaning the contacts on all the Credit unit Disc, the Ball Count disc and the player up unit disc. Once I put the disc's back in after cleaning everything seemed to work as far as player select, ball in play, etc... I am now left with one problem:
When I select 1 player, the lights all show one player however the game plays all the way through to the 4th player each time even though the players 2-4 score boxes the lights are off. If I select 2 players it still plays through all 4 players, and same with 3 players selected. I'm not sure where to go from here to fix that.
I also have one question that probably sounds like a stupid question...What are is the 00-90 unit Disc do and what to the green numbers at the top of the back glass mean when they light up? I'm talking the 00 10 20 30 40 50 60 70 80 90 numbers?
Thank You guys for the quick help. I'm excited to get this game up and running and amazed at the condition of it considering it's 46 years old and everything almost is working on it.