1971 Johnson 40HP outboards Service Repair Manual P/N JM-7107, Page 67Get this manual
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BATTERY STS HYDROM TEI TEST FLOAT MUST FREE
Rate Discharge Tester
Specific vit will va ry points (.00 4) Witll every 10 tu changeFo l1 10 below 80 F, subt its l1d1" digF or l1 10 ab