The extra wires are likely for the now removed coin lock out coil mech. (not needed in home use) Often removed due to loud buzzing and heat build up from a burnt coil (it's on all the time!) Parts look much better, will make a good player's game.

Two real easy things to check. Is there a switch closed on the coin door that is racking up credits? (or elsewhere in the credit relay, etc.) and manually reset that 9 to zero and see if the score motor stops. You likely need to adjust the switches on that score reel so it will do this itself upon start sequence. See the various EM repair sites mentioned countless times.......for details.