1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 228Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 228

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CHARGING SYSTEM

NOTE: #1 Disconnect Orange Wire From Alternator Battery TerminalSplice Sufficient Gauge Wire To The Orange Wire And Connect As ShownNOTE: #2 Gauge Minimum