Make sure it still moves freely. Check voltage at the lugs of the left flipper coil vs the right. Compare resistance of each coil. File the flipper button and EOS contacts.

You have to check the coil resistance of each winding with the EOS open or you'll get a bad reading.

Examine both sets of contacts on that left flipper switch. With power OFF, file them just a bit. Don't go overboard. Then adjust so that both make with the button pressed in.

Other possibilities are EOS switch on the flipper coil and failed winding as mentioned above. There's nothing else to really go wrong in the circuit.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Just compare the between left and right, with the eos held open. Flipper coils probably run on 25-30v AC for a game of that era. Anything over 20 should be fine.

You're checking for resistance of the coil, not the voltage. The resistance of the power side (the thicker wire) should be a bit above 2 ohms. The hold side will be a lot higher.

The coils run on 25v AC on the game. There are a few coils in a game that will use line voltage, but flipper coils are not one of them.

Had something similar with my bad cats. End up being end of stroke switch never opened , causing coil.to overheat and fry. Also had wrong fuse in machine causing coil to overheat because fuse was to big and did not blow in time. 150 bucks later , two new coils and masc parts, better than ever. Meow

One of the tilt switches is closed.
Check them all out.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

There's often a few slam switches on the door and on the bottom of the playfield

Newbie no more! Next time you see that problem you will know what to do. And you now have more confidence.