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Series FL23/600-30/2600 flipper coil wiring

On the series wound coil there is one diode. The two power wires (power daisy-chains to the next coil) are on one outer lug and go to the banded end of the diode. The other outer lug takes one EOS wire; which is the ground side and carries the thick winding, and to the middle lug.

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