How the System 11 A/C bank select works
Outputs 1-8 each drive two loads, one in bank A and one in bank C. A bank select relay sends coil power to bank A when off and to bank C when on, so only that bank can fire. The C bank is usually flash lamps.
Systems
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Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer