Firing a coil by grounding its ground lug

Steps

• With the game in attract mode and the playfield up, clip a lead to the metal side rail.
• Briefly touch the other end to the coil's ground lug: the one with the single thinner wire, or the non-banded end of the diode. For an FL11630 flipper coil (F-14 Tomcat onward) the middle lug is the one.
• The coil should fire. If not, it may be an A/C bank coil: enter diagnostics and try again.
• If it still does not fire, the coil is bad or its fuse is blown.

Touching the power lug instead shorts solenoid voltage to ground: the game resets or blows a fuse.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C

Related tips

• Fit coil diodes with the band on the power lug
• Wrong coils fire together (A/C bank game)
• What a bad coil diode does
• System 11 coil outputs
• 50 V coils on earlier System 11 games
• What changes when fixing coils on System 11
• Old Williams SA/SG 23-850 coils and their AE/AL replacements
• Coil sleeve part numbers by use

Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)