Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 670Get this manual
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SERVICE MANUAL NUMBER 24
Step 26 Step 28
Is There Spark at Coil? aSubstitute new ignition coil27bRepeat above testIs There Spark at Coil? 282930313233 Check IGNINJ fuseIs Fuse Good?