I recently rebuilt all 4 flippers on my Addams Family game, the game played great for about 2-3 weeks. Then it blew 2 flipper fuses, I counted it as a fluke, replaced them, and moved on. Now it's about 2 weeks later, and 1 of the fuses blew again. No longer a coincidence.

I checked all the wires to the switches and coils both times, and the connections seem solid. I do have a couple sloppy solders but I can't find anything touching something it shouldn't, and the connections aren't wiggling. Still, I'm planning to re-solder all the connections this weekend (I bought a better soldering iron since the rebuild).

Anyway, before I go through the hassle of re-soldering all 4 flippers, is there anything else I ought to look at?

Thanks for the tips so far.

I used this flipper rebuild kit from Pinball Life (bought two of them, used it for all 4 flippers), plus new bushings. I did not replace the coils, but the kit has new switches and I used those. It looks like one of the previous owners did replace at least 2 of the coils.

The first time, F901 (upper-left flipper) blew followed within seconds by F101 (lower left). Then shortly after, F902 (upper-right) and then F102 (lower-right). It was mid-game, so it all happened within a minute or so and while we were trying to figure out what was happening (hadn't had these fuses blow before!).

The most recent time, it was F102 (bottom right) and then we just stopped playing immediately until we could figure out what was going on.

All fuses were replaced with brand new (purchased about 3 months ago) 3A slow blow fuses.

I'll verify the other things FilthyRich mentioned after this, but the switches were brand new with the rebuild kit and otherwise have been working fine. Although I'm not 100% sure which part you're referring to: "the insulator, on the mechanism, that closes the EOS switch". Are you referring to the rubber tip I've pointed to in the attached pic?

Williams Bally Flipper Rebuild Kit - 08.93 to 10.98 (resized).jpg

Update: Seems like I made a mistake, I went back to test again and the flipper moved (but with problems) - retested the fuses, and they all show continuity. So I guess I mis-tested and jumped the gun, but there is a problem. So, the fuses only blew once several weeks ago, and now it's a new problem which I misdiagnosed.

Basically the flipper moves - but very slowly. The mechanism moves freely by hand, so it doesn't seem to be binding, it seems like the coil just lost all its motivation. So I guess I'm going to swap coils with the other bottom flipper and see if it's the coil or something else.