Quoted from Quench:Just incase it wasn't obvious/mentioned, the 17 pin connector with the multi colored wires is originally part of the generic backbox harness that connects to the J4 connector on the lamp driver board.
When Stern designed the VSU-100 speech board, they piggy backed it off the signals to the lamp driver board. So now, that multicolored wire 17 pin connector hooks up the the VSU-100 board and the 17 pin ribbon cable passes the signals to the lamp driver board.
i.e. you can plug that multicolored wire connector directly onto the lamp driver board J4 connector and the feature lamps will work (if you ever need to bypass the VSU-100 speech board for whatever reason).
Such a fabled connector, it should have its own chart:
Board/Location Pin # Wire Color - Actual Wire Color - Schematic Schematic Location
VSU-100 - "J1/J2" 1 W-R W-R Rectifier - A2J3-4
VSU-100 - "J1/J2" 2 R-B R-B Rectifier - A2J3-3
VSU-100 - "J1/J2" 3 B-G R-B SDB - A3 -J3-16
VSU-100 - "J1/J2" 4 O-G B on W MPU - A4J1-19
VSU-100 - "J1/J2" 5 O-R O-G(orBr) MPU - A4J1-18
VSU-100 - "J1/J2" 6 Br on W Br on W MPU - A4J1-17
VSU-100 - "J1/J2" 7 Br-Y Br-Y MPU - A4J1-16
VSU-100 - "J1/J2" 8 Key 8
VSU-100 - "J1/J2" 9 N/u 9
VSU-100 - "J1/J2" 10 N/u 10
VSU-100 - "J1/J2" 11 W-B W-B Rectifier - A2J2?-14
VSU-100 - "J1/J2" 12 G "spare"
VSU-100 - "J1/J2" 13 O/pink-W O/pink-W MPU - A4J1-11
VSU-100 - "J1/J2" 14 Y-B Y-B MPU - A4J1-15
VSU-100 - "J1/J2" 15 R on Y R o Y MPU - A4J1-14
VSU-100 - "J1/J2" 16 Light G-W G-W MPU - A4J1-13
VSU-100 - "J1/J2" 17 G-B G-B MPU - A4J1-12
so i happened to have photos of the connector before, i was able to double check that way with the schematic. but i am left with 3, 4, and 5, somewhat mysterious (i think 5 might match but I just am confusing the dash color on an O wire. But 3 and 4 definitely didn't match. I will check again, but I swear i tripled checked already. Since my machine was not using speech, i do not want to assume that the wiring before was correct. But i don't have a second R-B to plug into 3 anyway, nor is there a B on W wire to go onto 4 where the O-G was. I'm so far in the weeds right now I think I found a typo in the schematic where it references A2J2-14. It should be A2J3-14, b/c there are not 14 pins on J2 on that board.
I assuming I should just go with the original configuration of 3 and 4 since I would not have any other option anyway.