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Oil pressure switch.The Kohler Courage SV530-0022 has only one ignition coil with one white wire connected to it from the wiring harness. (See images.)
The red wire from the harness goes to the carb. The green wire goes to an unidentified contraption.
How would I test spark by removing the white wire?
By trying the start the engine. If it starts up then you must either choke the engine to death, shut the fuel supply, or pull the spark plug lead to stop the engine.