2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 95Get this manual
ELECTRICAL MWS CIRCUIT TESTS Press the tester NO OIL buttonThe gauge NO OIL light must turn on for 30 seconds, and the warning horn must sound for 10 seconds
Tachometer Test
Turn the key switch to ONMove tester TACH ONOFF switch to ONThe tachometer must read above 3000 RPM If the tachometer does not indicate this reading, check the instrument harness gray, black, and purple circuits for an open If the gray, black, and purple circuits are OK, replace tachometer
Trim Gauge Test
Turn the key switch to ONThe boat trim gauge should indicate full trim-up when tester TRIM SNDR switch is in UP position, and indicate full trim-down when tester switch is in DOWN position If gauge needle does not move, check ment harness whitetan, black, and purple CJ rcuits for an open If gauge needle moved in one direction but not the other, replace trim gauge