I've just about got my bad/broken wiring issues sorted out on my new (to me) 1974 Williams Strato-Flite. What's left is a confusing set up involving the replay stepper and one of my relays. In the process of fixing the broken line connection to the 10 point, 100 point and 1000 point relays, I found another broken wire (yellow in photos below) that looks like it used to run from the line in on the 1000 point relay to the replay stepper coil. There at the coil, this wire was connected to the wire from the 100 point relay (the brown-black wire in the photos below) which would advance the stepper according to the schematic. A photo of the stepper coil is shown below. The wires are not soldered to the coil.
It is missing the line in on the other lug, but I found this elsewhere in the back box (a loose red wire that I traced back to the plug). I have seen in multiple articles that disconnecting a wire from the replay stepper is done when a game is set to freeplay. When I checked on the credit unit stepper, the top switch is adjusted to remain closed for freeplay. So assuming the missing line in on the replay stepper coil was removed because the machine was now free to play, did this yellow wire from the other lug of the coil serve some purpose, either before or after it was converted to freeplay? I'm trying to figure out if I'm safe to remove it and discard it, or if it serves some purpose either in the ordinary operation of the machine or in the modified-for-freeplay version. I can not find an explanation for this wire on the schematic.
Thank you for your help diagnosing this one.