1994 Johnson/Evinrude Outboards 40 thru 55 Service Repair Manual P/N 500608, Page 140Get this manual
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15 DR4256
4 Adjust voltmeter to settings listed in following chartCrank engine and observe meterMeter must show at least: Models 40RS,RP; 45, 55 40RE, BA 12
Voltmeter "NEG ,"