I appreciate all the instruction and advice. From the last couple of replies, I think I understand what I need to do.
Since I have an Addams Family Gold machine, the "Extra Ball" button and switch wiring is already in place (see image). To make the "extra ball" (Buy in) lamp to work, I need to connect a yellow/black wire (instructions suggested using the Swamp "Lock" lamp socket) and a red/brown wire (instructions suggested using the "Lite Advance X" lamp socket on the right in-lane). Is the wire 22 awg? Do I need to solder the wires to the lamp sockets, can I use alligator clips to test that all works correctly?
Before connecting the wires to the lamp terminals on the back of the pushbutton, I need to install a 1N4004 diode (correct one?)on the red/brown wire with the banded side towards the switch. It won't matter which wire connects to which side of the lamp.
Please let me know if I have understood everything correctly?
IMG_5520 (resized).jpegIMG_5521 (resized).jpeg