1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 210Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 210

Quality of the image is intentionally reduced!

CHARGING SYSTEM
Charging System
1 Check belt condition and tension2 Check battery condition

3 With fully charged battery, connect voltmeter leads directly to the battery posts