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Ronsue, the coil post marked negative is not a ground. It's where the wire from the distributor attaches that switches the coil on and off about 20 times per second at idle and roughly 70 times per second at cruising speed. Voltage measurements using that post are not helpful in diagnoses.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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