Only thing it could be is a wire or a bad fuse. Check to see if the fuse for that flipper is blown

Flipper relay solder points could be bad, the contact points on the flipper relay itself could be bad.

Did you test them inside the game or did you pull them?

Do you by chance have the coils wired backwards? I’ll have to check what mine look like but if there are diodes on the coil itself, make sure the band is facing the ground wires and not the power wire.

Maybe you flipped them though? It’s easy to get it backwards and have it look the same simply by flipping the coil to the other direction. I remember when you first got it they were technically upside down since the lugs were on the same side as the coil stop. The 50v power wire is Blue/? Depending on the flipper side, the ground is the other color, make sure the band on the diode is not facing the blue wire. Here’s mine for example

3A9A81C4-E819-44FB-B434-A29DFB36AEC0 (resized).jpeg

Sorry. Please don't take this personally. I don't bother posting much nowadays. Just a bystander for the most part. I do however feel compelled to post when the information provided is incorrect. This is to prevent other people from reading it and assuming it's correct and causing further damage.

The banded end of the diode must always face the power wire NOT the ground wire.

For System 11 games (and pre-fliptronic WPC games) the GRY-YEL and BLU-YEL wires are the power wires.

The wire colors from the flipper solenoid to the cabinet switches BLU-GRY, BLU-VIO, BLK-YEL and BLK-BLU.

The wire colors from the cabinet switches to the flipper ground relay are ORG-GRY and ORG-VIO.

Please see the attached images drawn the manual.

flipper_wire_colors.jpg

flipper_cabinet_wiring.jpg

flipper_circuit_diagram.jpg

I did get it backwards! Luckily haven’t done it backwards myself. Thanks for the correction!

You'd have to start the game and measure on points into and out of the relay. I'd have to look to see where the appropriate links would be. Most of the time as part of getting a new game in I reflow solder on all the header pins and replace any that are burnt, and as part of this I reflow the relay's because it's a relatively heavy item that has lots of stress put on it. They use a double pole relay to keep the flipper circuitry separate but still have one point to turn the flippers on and off.

This is one area where Gottlieb got it right in solid state! Open frame relays so you can test easily, replace contacts/blades if needed, and clean the contacts!