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  1. M

    4.3 no spark voltage at coil drops from 12.6 to 2 volts or less while cranking

    I have a 1986 INvader with a 4.3 mercruiser I converted from OMC cobra outdrive to Alpha 1. It has alway been hard to turn over, despite great compression and several new batteries, etc. Recently it began stumbling under load (@2500rpm) and I started to troubleshoot. I did the usual checks...
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