Which coil lug gets the power wire
The power wire (often the thicker wire, or two wires) goes on the lug with the banded end of the diode. The thinner return wire to the driver transistor goes on the lug with the unbanded end.
Systems
Related tips
- Check for power at a coil or flashlamp
- Check the wire from the coil to its driver transistor
- New coil's diode faces the other way: keep each wire on the same diode end
- Which way a coil diode goes
- Which way a coil diode goes
- Check the coil diode after replacing a driver
- Old Williams SA/SG 23-850 coils and their AE/AL replacements
- Coil outputs available on System 3-7
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)