Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 703Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 703

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DIAGNOSTICS
121 BRN OR GRY 121 WHT TACH

When the system is running on the ignition module or in crank mode, there is no voltage on CKT 424 and the ignition module grounds CKT 423 Th

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