1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 74Get this manual
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BATT ERY TEST HY DROMET ER TES FLOA UST BE REE EYE WI TH LIQUID SURFAC MAKE COR EC TION FOR MP RATUR E
Disconnect batte ry
positive
charging
3 Variation of