1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 177Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 177

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STARTING SYSTEM
Starter Motor Voltage
Always test the voltage at the starter motor to ensure that it is getting at least 9.5 volts during crankingIMPORTANT: Voltage below 9.5 causes excess