Rolf,
Thank you for all that info. You are correct I am trying to build an Extra Ball Relay Assembly (available on request) from parts. I like your idea of building a "red box" that does both if it was for me but my friend wants this (just extra ball). I have all the parts needed but as you said and I found, the drawing of the relay from Williams is not right or clear. There is no way to energize the coil. I think I have all the wires correct on the connector and I am adding a wire from "R2" as you call it to the coil at the N/O contact (bottom blade).
So this is how I will wire it:
L1 and R1 to NC contacts
L2 is a dead end
R2 to bottom blade of N/O contacts to energize coil (extra ball relay coil)
L3 to top blade of N/O contacts to energize coil
R3 and L4 to N/O contacts to energize lamps
R4 to other side of coil (extra ball relay coil)
Does this sound about right?
If some one would send a pic of this assembly that would be most helpful. I will be happy to send the pic to IPDB.
I know my OXO is set up for extra ball. I will have to look into what you said about that game. Thanks