1989 Johnson Evinrude "CE" 120/125/140/185/200/225/300 HP Service/Repair Manual P/N 507758, Page 316Get this manual
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Battery Charging Boost charge 12-volt batteries at 50 amperes for 20 minutes (1000 ampere minutes)If the charger will not give this rate, charge for an equal number of ampere minutes at best rate avai