Hey guys!

My girlfriends grandma was given a 1972 Williams Swinger machine years ago and I am currently trying to fix it. I have replaced several coils, the fuses, the rubbers, some bulbs, etc. The machine has been in a closed storage facility for about 15 years.

The main issue: whenever the "Down Post" buttons are lit up (because the post between the bumpers is up) and they get hit the game, the 15A Fuse blows. I could really use some help on this from anyone who has dealt with this machine or has a lot of knowledge with old EM's. The old coil that made the Post up/down movement was burnt out when I opened the machine for the first time, so I don't even know when it stopped working.

Pictures attached are the playfield so you can see the buttons/posts, the G-23-750 coil that replaced the burnt out post, and the post relay switch. Please let me know if you guys need any more information, and thanks a bunch!

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So when it comes to the down post there is the switch located directly under the button, and the switches next to the post which move it up or down, and I BELIEVE it is connected to the post relay switch too. All of them look correct to me with no wire damage (granted I have very limited pinball knowledge) so a few questions:

I noticed that the G-23-750 coil that I have replaced for the post has a resistor (maybe?) which none of the other do. It connects both sides by metal which I would assume is a problem?

On the "Post Relay" coil picture the far right switch (the metallic silver looking one) was almost fused shut when I saw it first. I cleaned it softly with a small file opened it which is what I think the schematics said (someone please double check this I am not the best at schematics).

Thank you so much! Once I cut the diode it worked perfectly.

My next problem to tackle is the score counter which never goes above 900. I plan on doing a deep clean and thorough check of the wires this weekend so hopefully I can fix it without needed help.