MH I belive you are over thinking this. Just behind where the coinbox sits, left of center, should be one or two female Jones plug with 3 or 4 single male plugs off to the side. These control the pulse settings for the coin shoots and allow dimes, quarters or sba's depending on your preference. Consult the manual for the proper coin setup determined by the the wire color combinations. Be sure to follow what goes where or the game will misbehave depending on how you set those plugs

Those wires in your pic are factory and are for the 3rd coin shoot that was not factory installed. It was purposely left that way for operators to modify their coin shoots which was standard practice for Bally during the period as explained in the manual. This applies to all the rest of your dead-end wires and empty switch connections. I would put the notion that a prior owner sabotaged this game aside. Bally, Williams and gottlieb were pumping titles out at breakneck speeds during this time and not building wire harnesses and scoring motors for individual games, they used universal harnesses and motors for dozen of titles and not all wires or switches were used depending on the game. I am not am EM expert but have had similar problems to this when getting my Bally's back to basics and excepting coins. I would definitely recommend listening to HowardR and Tuukka as they can guide you back to getting this game to functional. If you don't have a printed manual a pdf should be available at https://www.ipdb.org/machine.cgi?id=362

MH that schematic is mainly for adding a 3rd coin shoot which you do not have. Disregard that and consult the written portion of the manual for the proper wire setup for the 3 Jones plug. From your previous post it sounds like it adds 1 credit for 1 coin which is fine for now. As for you problem adding credits while playing take a look at the bonus counter in the back box. Unplug whatever wire is in there now and plug the grey wire into the 0000 section. The game should now only add bonus credits once you hit 190k points. If this is not the case report back and hopefully someone can guide you from there. If the game is not subtracting credits on start up follow the wires on the credit unit and be sure that someone did not add a switch or toggle as a free play hack. As for the knocker coil locking on you should be able to follow the schematic for the issue fairly easily as it is at the end of the line. It seems you have seperate issues going on all at once so be sure to post what you are trying to accomplish and take it 1 step at a time.

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