1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 253Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 253

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FUEL INJECTION SYSTEM DESCRIPTIONOPERATION
aTest LightBatteryAmmeter IMPORTANT: If the ammeter indicates LESS than 310 ampcurrent flow (.3 or 300 mA), the test light is SAFE to useIf the ammeter