1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 370Get this manual

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DIAGNOSTICS
Step 25 Step 27
Is There Spark at Coil? aSubstitute new ignition coil26bRepeat above testIs There Spark at Coil? 272829303132 Check IGNINJ fuseIs Fuse Good? Replace ignition se

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