1999 EE Johnson Outboards 25, 35 3-Cylinder Service Manual, Page 216Get 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 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
In Step 2, connect the voltmeter leads only while the engine is cranking, or damage to the voltmeter can occur
rn 2solenoid terminalWhile cranking to the starter side of the Connect voltmeter negative lead starter 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 engineDR4030