Electrical System Troubleshooting; General Checks; Troubleshooting The "Down Circuit - Mercury Optimax 115 Service Manual

Electrical System Troubleshooting

General Checks

Before troubleshooting the Power Trim electrical system, check the following:
1. Check for disconnected wires.
2. Make certain all connections are tight and corrosion free.
3. Check that plug-in connectors are fully engaged.
4. Make certain battery is fully charged.
Refer to the preceding four wiring diagrams for connection points when troubleshooting
the electrical systems (Connection points are specified by number.)

Troubleshooting the "Down Circuit"

Battery Voltage Indicated:
Connect Voltmeter red lead to
Point 3.
Battery Voltage Indicated:
Connect Voltmeter red lead to
Point 2.
Depress "Down" trim button.
Battery Voltage Indicated:
Test UP relay.
Refer to page 5B-13 for relay
test procedure.
Relay good:
Pump motor wiring is defec-
tive.
Pump motor is defective.
90-855347R1 JANUARY 1999
Connect Voltmeter red lead to
Point 1 and black lead to ground.
Depress the "Down" trim button.
No Voltage Indicated:
There is an open circuit be-
tween Point 3 and positive (+)
battery terminal.
Check for loose or corroded
connections.
Check wires for open.
No Voltage Indicated:
Relay Switch is defective.
POWER TRIM
No Voltage Indicated:
Connect Voltmeter red lead to
Point 4 and black lead to ground.
Depress "Down" trim button. If
battery voltage is indicated, wire
is open between Points 4 and 1.
No Voltage Indicated:
Connect Voltmeter red lead to
Point 5. If battery voltage is indi-
cated, trim switch is faulty. If no
battery voltage, check for loose
or corroded connection at Point
5 or open circuit in wire supply-
ing current to Point 5.
Page 5B-15