1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 364Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 364

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DIAGNOSTICS

INJECMKS MODULE

CIRCUIT DESCRIPTION:
Battery voltage is constantly supplied to terminal "30" of the system relayWhen the ignition switch is moved to the "RU