I have a Williams Black Knight 1980 vintage, Everything was working on game and I went and replaced bulbs with LED's and added a special solenoid fuse block from NAVRAM. I think everything was working shortly after doing these two upgrades but I played a little later and the lower right drop targets are not working.
Went to solenoid test mode and nothing happens as it tests solenoid #3 which corresponds with this drop target. Looked at all wiring thinking I may have knocked something loose but all wires underneath look good. Everything else works on game so I don't think there is a single fuse for this one drop target.
I am somewhat capable of doing simple repairs if I have some guidance on what and how to test to track down this problem. Thanks for any suggestions!