1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175 Service Repair Manual, P/N 507874, Page 377Get this manual
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Handling LeadAcid Batteries
Changing Lead Acid Batteries (1) Attach and remove these cables with charger UNPLUGGED from 110 volt wall socket(Prevents shocks if the charger is defective (2