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    Mercury 500 Spark for 15-20 seconds at start-up. then nothing.

    Mercury 500 1974 SN 4072091 Type II Thunderbolt. I have good spark for 15 seconds and the motor dies. Will stay dead for an hour and re-fire but again dies after 15 -20 seconds. As soon as it died, I tested for spark off of the coil wire and had no spark, I tested ohms of the 3 wires going to...
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