Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 263Get this manual
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STARTING SYSTEM
20 Amps 2-12 Hours 3-12 Hours Hours 7-12 Hours 10 Hours
30 Amps Hours 2-12 Hours Hours Hours 6-12 Hours
15 Hours 20 Hours 30 Hours
2 Hours