1982 Johnson/Evinrude 2 thru V-6 Service Repair Manual P/N 392790, Page 27Get this manual

1982 Johnson/Evinrude 2 thru V-6 Service Repair Manual P/N 392790, Page 27

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Handling Lead Acid Batteries
(3) Always charge in well ventilated Charging causes acid solution to give off Hydrogen gas thru the Vents in the Caps Make sure Vents If :, clogged, pressure inside