Hi SDM0
if the pin would be a Jubilee:
See the first picture, JPG, "encircled green" - when You make 10 points: The medium chime chimes and the No. Match Unit steps - ALSO the Ball-Index-Relay is made pulling-in (and it closes its Self-Hold-Switch and stays pulling for the rest of the life of the ball).
Jubilee has (encircled red) also switches on the 100-Point-Relay and the 1000-Point-Relay to make the Ball-Index-Relay to pull-in. After loss of the ball: The pulling Ball-Index-Relay makes "stepping to next player / next ball" possible.
So in a Jubilee I would say "encircled red" is not functioning. Do You have an schematics and an manual "Darling" ? - look-up for connecting wires, wire-colors, (in the last pages of the manual) the position of the switches on these relays. If You have no paper stuff: Have a look at the 10-, 100-, 1000-Point-Relay(s) - clean contact-points on the switchblades - look for broken-off wires.
(I like to do some "work" in MS-Paint / paint.net - freshening-up JPGs) I have put together snippets of "Jubilee" to an continuous schematics, then did a lot of work to freshen-up, then made an PDF - then used an "PDF-Reducer" and the second picture, PDF shows "my work". May want to make You a copy / download (?).
BECAUSE I might have made an error / faulty deleting stuff in my work: ALSO copy / download from here: https://pinside.com/pinball/forum/topic/williams-jubilee-gi-lamp-fuse-pops-on-start-up/page/2#post-3251666 --- the "ORIGINAL PAGES". Greetings Rolf
0Jubilee-Work-03 (resized).jpg
0Jubilee-lot-of-work-done-orpalis.pdf