1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 249Get this manual

1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 249

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a Disable ignition system by removin coil high tension lead from center of distributor cap and ground ulis lead to engine blockbConnect V-O-A Tester (0-20 volt scale) across battery tenninalscDi sconn