1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 767Get this manual
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(2) Check for resistan be t'e lue Ire and black ju mpe ""i re (3) heck black gr ound wire for sis lance(4) lI igh resistance on of the preceding checks req uires repl ac ement of frame and field Vitb