1996 Johnson Evinrude "ED" 9.9 thru 30 2-Cylinder Service Repair Manual, P/N 507122, Page 349Get this manual
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Handling LeadAcid Batteries
Charging Lead Acid Batteries
(1) Attach and remove these cables with charger UNPLUGGED from 110 volt wall socket(Prevents shocks if the charger is defect