1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 228Get 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
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 dropConnect voltmeter negative lead to starter solenoid positive terminalTurn key switch to START to crank engineVoltage reading should not exceed 0.3 volt
OJ 1Connect voltmeter positive lead to battery positive post
INotel In Step 2, connect the voltmeter leads only while the engine is crankingor damage to the voltmeter can occur2Connect voltmeter negative lead to the starter side of the starter solenoid terminalWhile cranking engine, connect voltmeter positive lead to starter solenoid opposite terminalVoltage reading should not exceed 0.2 voltRemove voltmeter positive lead from starter solenoid and stop cranking engine3Connect voltmeter positive lead to starter solenoid, starter lead terminalConnect voltmeter negative lead to starter motor terminalTurn key switch to STARTVoltage reading should not exceed 0.2 volt4Connect voltmeter positive lead to battery negative lead common powerhead ground screwConnect voltmeter negative lead to battery negative postTurn key switch to STARTVoltage reading should not exceed 0.3 volt