1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 271Get this manual
1 Starter System Voltage Drop Test
By making systematic check of the starter system, any component or electrical connection having excessive resistance can be located&
Avoid accidental starting of engine while servicing; twist and remove all spark plug leads
Clean and retighten, or replace, any connection, cable, or component having greater than specified voltage drop
1Connect voltmeter positive lead to battery positive postConnect voltmeter negative lead to starter solenoid positive terminalTurn key switch to START to crank engineVoltage reading should not exceed 0.3 volt