Hello,
First time posting on here.
I have a williams jubilee I picked up not too long ago and have been trying to get it to work. Im pretty logically oriented so I have a good understanding on how ems work. I have went through the stepper units and made sure the contacts are clean and mechanically function and have went through the game and made sure all the switches move properly (active and inactive) states. The problem I am running into is that most of everything works as it should with the exception of the advance scoring process. If either the advance/ 3-advance relays are activated (any advance switch on PF) the 15 amp fuse blows. I have narrowed it down to the leaf switch on both relays that "Energizes advance unit step up coil". I have tested this by only allowing this leaf switch to connect and it blows the fuse. I have manually step upped the advance stepper unit and on ball drain the bonus counts down and stepper steps down back to home pos without blowing the fuse. I am at a loss here as it seems to be possibly a dead short?? Any help would be appreciated.

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do you have to desolder it to check the ohms?

I assumed as much. It was a bit hard to get a good reading on it so I went ahead and pulled it. It came back with .7/.8 ohms so not a zero probably bad enough where it would blow the fuse. Upon pulling the wrapper it looks as though someone previous has tried to fix the coil since some of the wire had been unwrapped stripped of the coating and rewound. Guess I will buy a new one.

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Yes sir. Normally when I go through a game after getting it if it isnt working already I check all the leaf stacks to make sure they have open and closed positions prior to even powering up the game. Ive seen a few toasty lock coils thankfully I havent had to deal with any until this game which im replacing as well. Thanks for the assistance. Guess we will see what happens when I get the new ones in. If all goes well I will be able to start taking everything else apart and cleaning for a lifetime and bringing it all back together again.