Hi Brypten
I let post-13 for the moment and concentrate on post-10. No luck with jumpering --- some theory:
The schematics is "abstract, drawn beautyful, stuff is grouped by 'functionality' ". Look at many Williams-Schematics - it always looks the same.
On the left (schematics) there is the transformer - then comes stuff "throwing-in coins, starting the game" --- outmost right there are Bumper-Coils, Slingshot-Kicker-Coils and the Flipper-Bats.
Look at the JPG - the 25 Cent-Relay has DIRECT connection on the POWER-Side (wire-black to fuse to Transformer-HOT). To operate the 25-Cent-Relay: Switches on the RETURN-Side to Transformer-Lug-YELLOW are closed.
Williams do not want YOU to operate the flipper-bats (and other stuff) when the game is OVER --- they sneaked-in into the POWER-Side-Connection a "Switch on Game-Over-Relay to open" (see it ?) ALSO YOU shall not operate the flipper-bats (and other stuff) when the pin is busy "resetting" so they sneaked-in a "Switch to open when the Reset-Stuff happens , means the Reset-Reset-Relay is pulling" (see the switch ?). As the schematics is beautyful, GROUPED: The BALL-RELEASE-COIL is drawn near other stuff handling the Ball --- BUT the connection on the POWER-Side is AFTER the "Switch on Game-Over-Relay" (see my pink line ?)
"Why does the "Coil on Ball-Release-Kicker" NOT fire ? The jumpering on the "Return-side to transformer-yellow" did not make it fire --- maybe (maybe) the connection on the POWER-Side is no good ???
Test-Variation-AAA: Toggle-off the pin and set a permanent Jumper "like my pink line" - connecting the Coil on Ball-Release (side lug-red) to Switch on Game-Over-Relay - side lug-red. Then toggle-on, start a game ... do testing as written in post-9.
Test-Variation-BBB: BECAUSE You have "no firing" with the "test like in post-9": You can do a permanent jumper on the return-side (((Just for testing !!!))) --- then take another Jumper-Wire, clip-on at Ball-Release-Coil-side-red --- start a game ... tip the gator-clip onto FUSE-HOLDER SIDE "WIRE-BLACK IS SOLDERED-ON" (((NEVER USE the other side on the Fuse-Holder --- You ALWAYS want the FUSE IN (!!!) YOUR circuitry !!!))). NEVER touch wire / metal on POWER-Side --- ALWAYS grab the INSULATED wire, NOT the gator-clip, greetings Rolf
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