1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 55Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 55

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TROUBLESHOOTING
Radio Noise
Cause "popping" noise that will increase with engine rpmNoise will stop as soon as engine is turned offA "High pitched whine" in the radio "hissing or crackling