Troubleshooting The "Up" Circuit - Mercury 150 EFI Service Manual

POWER TRIM

Troubleshooting the "Up" Circuit

Battery Voltage Indicated:
Connect Voltmeter red lead to
Point 9.
Battery Voltage Indicated:
Connect Voltmeter red lead to
Point 6.
Depress "Up" trim button.
Battery Voltage Indicated:
Test DOWN relay.
Refer to page 5B-13 for relay
test procedure.
Relay good:
Pump motor wiring is defec-
tive.
Pump motor is defective.
Page 5B-16
Connect Voltmeter red lead to
Point 8 and black lead to ground.
Depress the "Up" trim button.
No Voltage Indicated:
There is an open circuit be-
tween Point 9 and positive (+)
battery terminal.
Check for loose or corroded
connections.
Check wires for open circuit.
No Voltage Indicated:
Relay Switch is defective.
No Voltage Indicated:
Connect Voltmeter red lead to
Point 7 and black lead to ground.
Depress "Up" trim button. If bat-
tery voltage is indicated, wire is
open between Points 7 and 8.
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.
90-883728 JULY 2001