2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 205Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 205

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Handling LeadAcid Batteries
2) Observe correct polarity when connecting these larger leadsAlways charge in well ventilated Charging causes acid solution to give off hydrogen gas through the vent