1996 Johnson/Evinrude Outboards 8 thru 15 Four-Stroke Service Manual, Page 247Get this manual
Starter System Voltage Drop Test
By making systematic check of the starter system, any component or electrical connection having excessive resistance can be located
accidental starting of engine while servicing; twist and remove all spark plug leadsClean 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