1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 54Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 54

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TROUBLESHOOTING
Charging System Inoperative
Cause Loose or broken serpentine belt Engine rpm too low on initial start Loose or corroded electrical connections Faulty battery gauge Battery