Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 668Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 668

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SERVICE MANUAL NUMBER 24
Step 7 Step 8
Step 19cUsing DVOM, check voltage from CKT 121 tach terminal to groundIs Voltage Reading Greater Than 10 Volts? aUsing test light connected to ground