For that double/triple bonus problem. I'd probably start by checking the motor make/break switch 3C (red arrow). Check to see that the switch connected to the YEL and B-Y wires is open when the score motor is at rest (home position). The drawings of the score motor cams and switches on the lower left part of the schematic should help you locate the switch.

The circuit that turns on the triple bonus relay is highlighted in red below:
DC bonus stuff (resized).JPG

Here's a link from ipdb:

https://www.ipdb.org/files/649/Williams_1973_Dealer_s_Choice_Schematic_Diagram_continuous.pdf

There's no physical correlation between where a relay (or any other component) is on a schematic, and where it is on the machine. When the machine is new, the relays are usually labeled, but of course over time, the paper labels may have fallen off or faded. In that case, you have to go by the number and type of switches on each relay, and wire colors if they're still readable to identify each relay.

The manual (here: https://www.ipdb.org/files/649/Williams_Dealer_s_Choice_manual.pdf) has nice drawings of each relay with its switches labeled starting on page 21. That's a nice thing about Williams manuals.

Did you check out that motor switch 3-C that I mentioned earlier? Do you know where it is?

I don't know if this will help you understand or confuse you, but I'll explain why I thought the Motor 3-C switch might be a likely culprit for your problem. Besides, I'm bored and enjoy drawing pictures.

**Remember that as the score motor rotates through its half-turn cycle, the switches on it change state in order - 1, 2, 3, 4, 5 because the notches on the cams are staggered that way.**

So here's maybe more of an explanation than you want - or maybe it will help:

*************************************************************

FIRST TIME ALL 9 SWITCHES ARE COMPLETED (Achieves Double Bonus)

- No. 1 thru 9 latching relay switches (pic 1) are now closed, so “1-9 Reset Relay” is energized through the Motor Index switch and locks in thru green circuit.

- A switch on “1 to 9 Reset Relay” starts the score motor, which rotates half a turn.

- When the score motor closes motor switch 3A (pic 3), the “1 to 9 Bank Reset” coil fires, resetting (opening) all 1-9 relay switches. “1-9 Reset Relay” is still locked through green circuit below, though.

- “1 to 9 Reset Relay” switch in orange (pic 2) is now closed, so when the score motor closes motor switch 4A, the “Double Bonus Relay” is energized and locks in through “Outhole Relay” m/b switch, so it stays energized. This means that the “Double Bonus Relay” switch in red (pic 2) is now closed.

- As score motor continues to rotate, motor switch 5C (in green circuit below) opens to turn off the “1 to 9 Reset Relay”.

************************************************************

SECOND TIME ALL 9 SWITCHES ARE COMPLETED (Achieves Triple Bonus)

- No. 1 thru 9 latching relay switches (pic 1) are now closed, so “1-9 Reset Relay” is energized and locks in thru green circuit.

- A switch on 1 to 9 Reset Relay starts score motor, which rotates half a turn.

- Red “1 to 9 Reset Relay” and “Double Bonus Relay” switches are both closed now (pic. 2), so when score motor closes motor switch 3C, the Triple Bonus Relay is energized. It locks on through Outhole Relay switch.

- At almost the same time, a switch at Motor 3A (pic 3) resets all the 1-9 switches to open again.

The "Double Bonus Relay" and "Triple Bonus Relay" remain energized until the "Outhole Relay" fires, which releases them.

*******************************************************************

The reason I thought that your problem might be caused by that Motor 3-C switch in pic 2 being closed is that that switch is in series with the 2 switches that energize the "Triple Bonus Relay" coil. Those 2 switches both are closed when the "Double Bonus Relay" coil fires, so that would fire your "Triple Bonus Relay" coil as well if that Motor 3-C switch were closed or shorted.

Now that I've written all that, it'll probably wind up being something else....but I think it's a good starting point.

DC pic 1 (resized).jpgDC pic 2 (resized).jpgDC pic 3 (resized).jpg

Yeah, that can happen - a switch can have the contacts so close that vibrations in other parts of the machine can close them temporarily. Easy enough to fix - the trick is finding the right contacts.

Yeah, what Howard said - you can cause yourself all sorts of hard-to-diagnose problems if you mess up your score motor switches.

I think with those Willliams score motors, you can unscrew the bottom of the frame from the bottom board and lift the score motor enough to see the switches pretty well. You can carefully turn the score motor by hand and see if the switches are opening/closing as they should, and clean them if necessary. Just be careful.