Just spent the last couple of months restoring a 1955 Williams Three Deuces and now I would love to play this game but there’s an issue.

When turning game on, the 10K Stepper Unit coil immediately locks on and also the score motor spins continuously. Otherwise it goes through a lot of the reset including resetting the 100K stepper and relay bank.

I carefully checked every PF switch to make sure they’re open and looked for any shorts. Haven’t found anything there.

Attaching section of the schematic to see if I’m missing anything else that would fire the 10K stepper unit coil at startup and lock on.

Thanks for any help.

10,000 Stepper Unit .pdf

Yes all sws open on bumper relay

Blocked the 3 Queens relay and 100K Zero position sws and 10K still locks on.

Also made sure other associated sws Bumper Relay, Kicker sws and Counter sws are all open.

Unplugging one of the jones plugs to PF still get lights but no startup. Other jones plugs no power.

Yes Reset relay is stuck on. Advancing 100K releases Reset relay, stops motor and game plays. But this is with 10K coil disconnected otherwise just touching 10K wire to 10K terminal fires 10K without any closed pf switches associated with 10K.

Thought it might be one of the pf sws associated with 10K might be shorted to common wire that is daisy chained on the pf. If I measure ohms from 10K coil to common pf wire I get 0.4 ohms. Does this indicate short?

Starting to think in that direction since I inspected entire underside of pf for shorts and don't see any.

Mark - if I pull a Jones plug, then what?

Problem solved! Desoldered one of the kickers, then a counter switch, and finally on the third desolder of a counter sw got a good reading on ohm meter. Examined the sw closely and couldn't find anything and resoldered and everything works. So it was definitely that counter sw but still a mystery where it was making contact.

I previously had pf lights and scoring but suddenly that's not working so I must have disconnected something in the above exercise. Back to the drawing board, I mean schematic. Thanks for your help @MMarkG and @dr_nybble.