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The PLC inside the KSM needs power at pin four from a source, such as the key-switch, that
provides power only when the boat is in operation. See Figure A2.
Example of existing key-switch.
Figure A2: Typical Boat Key-Switch Schematic
NOTE: "S" terminal receives power when the key-switch initiates an engine starting event.
The power is also supplied to Pin 3 of the KSM, bringing the KSM online to supply
engine starting power.
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