1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 303Get this manual
Starter System Voltage Drop Test
By making systematic check ofthe 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 voltis cranking, or damage to the voltmeter can occur