2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 98Get this manual
ELECTRICAL ELECTRIC STARTER TESTS
Voltage Drop Test
WARNING
To prevent accidental starting while servicing, twist and remove all spark plug leadsIf it is necessary to remove spark plugs, be sure to keep the spark tester away from open spark plug holes
Connect voltmeter negative (-) lead to the starter solenoid, starter lead terminalWhile cranking engine, connect voltmeter positive (+) lead to starter solenoid terminal opposite starter lead terminal Voltage must not be more than 0.2 V