1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 200Get this manual
Troubleshooting the "Down" and "Up" Circuits (All Circuits Inoperative) Check in-line fuse (under cowl) to see if fuse is blownBlown Fuse:
Fuse Not Blown:
Correct problem that caused fuse to blow Replace fuse
Connect Voltmeter red lead to Point and black lead to groundBattery voltage should be indicatedNo Voltage Indicated:
Battery Voltage Indicated:
Check battery leads for poor connections or open circuits Check battery charge
Connect Voltmeter red lead to Point and black lead to ground Depress "Up" trim button and check for battery voltageNo Voltage Indicated:
Battery Voltage Indicated: