1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 268Get this manual
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SUMMARY ALTERNATOR CHECKS COMPONENT CO NN EC TI ON EADI NG RESUL TS
.35 to .45 ohm
MerCrui ser 80-90
Red to Red Red to Blue Red to lue Red to Ground Red to Groun