1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 208Get this manual
Troubleshooting the "Down" Circuit (When "Up" Circuit Is OK) Connect Voltmeter fed lead 10 Point and black lead to Point 2Depress theDown" trim bullonBatlery voltage should be indicatedBatlery Voltage Indicated:
Connect Vo ltmeter fed lead to Point 12Voltage should be indicatedNo Voltage Indicated:
Connect Voltmeter black lead to Point 3Depress "Down" trim button 11 battery voltage is indicated, black jumper wire between solenoi ds is openBatter Vol tage Indicated:
No Voltage Indicated:
Ch eckDown" solenoid terminals fo loose or co rroded connectfons
There is an open circui between Point 12 and positive (+) battery terminal