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.

Scott

IMG_9501 (resized).jpeg

IMG_9510 (resized).jpeg

IMG_9511 (resized).jpeg

I'm looking at the pages of the manual and the schematic shown below. If I'm reading correctly, the red wire in position 2 on the 24 pin jack in the back box is carrying power to one side of both the relays and the replay unit. This matches up with me finding two red wires soldered to the jack but hanging loose in the box. There was also part of a broken red wire still attached at the 1000 pt relay.

What makes no sense to me is the broken yellow wire. Why would it be on the relay at all if the red was supplying the power? The fact that the yellow is attached to the relay side of the replay unit coil also makes no sense to me. One side should be red per the schematic, and the other side is the Br-B on the schematic (which is still there, running between the 100 pt relay and the coil).

Is there a reason for multiple connections on the power side of a coil unless it is just daisy chaining multiple coils together to supply power? And does bypassing the coil in the case of the replay unit serve some purpose?

Since there is a yellow wire labeled as "feed" in position 8 on the 24 pin jack, I will trace it when I'm home to see if it is intact. Otherwise I'm at a loss to understand why the yellow wire would have connected the 1000 pt relay (from the power side) to the replay unit.

Jack Layout 1 (resized).JPG

Schematic 1 (resized).JPG

Schematic 2 (resized).JPG

I think I've made things more confusing. The stepper coil I'm referring to is the continuous stepper that says "No. Match Unit." Not Ball Count or Credit Count. Sorry.

I'm trying to understand, so tell me if this is wrong: something triggers the 100 pt relay coil to energize, which in turn triggers all the included switches. In the case of the no. match unit, the BLU-W and BR-B make a circuit and sends the signal on to the stepper to complete the circuit there, energize the coil and advance the match no. The wires that are confusing me were apparently joining two coils directly to each other which did not make sense to me.

Side note: are the pictures that I posted not of the schematic and manual? I got the Jack Layout from a manual purchased through PBR. The wiring diagram is from IPDB.