1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 247Get this manual
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Starter System Voltage Drop Test
By making systematic check from the positive battery terminal, through the starting circuit and back to the negative battery terminal, any component or electrical connection having excessive resistance can be located below
ill twist and remove all spark plug leads
'" To avoid accidental starting of engine while servicing,
Clean and retighten, or replace, any connectioncable, or component having greater than specified voltage drop1Connect voltmeter positive lead to battery positive postConnect voltmeter negative lead to starter solenoid positive terminalTurn key switch to "Start" to crank engine Voltage reading should not exceed 0.3 volt