Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 286Get this manual
Troubleshooting the "Down" Circuit (When "Up" Circuit Is OK) Connect Volt meter red lead to Point and black lead to Point 2Oepress the "Down" trim buttonBallery voltage should be indicatedBatter Voltage Indicated: Connect Voltmeter red lead to Point 11 Voltage should be indicatedNo Voltll.ge Indicated: Connect Voltmeter black lead to Point 3Depress "Oown" trim button1 battery 'Iollage is indicated, black jumper wire between solenoi ds is open
Battary Voltage Indicated:
No Voltage Indic atedThere is an open circui between Point 11 positive (+ballery ter minal
Check "Down" solenoid term inals for loose or corroded connections