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Mercury 45 Jet 50-55 - Troubleshooting the Down and Up Circuits (All Circuits Inoperative)

Mercury 45 Jet 50-55
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Battery Voltage Indicated:
No Voltage Indicated:
Battery Voltage Indicated:
Battery Voltage Indicated:
Battery Voltage Indicated:
No Voltage Indicated:
No Voltage Indicated:
No Voltage Indicated:
Blown Fuse: Fuse Not Blown:
Check in-line fuse (under cowl) to
see if fuse is blown
Correct problem that caused
fuse to blow.
Replace fuse.
Check battery leads for poor
connections or open circuits.
Check battery charge.
Connect Voltmeter red lead to
Point 8 and black lead to ground.
Depress “Up” trim button and
check for battery voltage.
Check black ground wires for
poor connection or poor ground.
Pump motor is faulty. Refer to
“Motor and Electrical Tests/Rep-
air,” following.
Check for open circuit in wire.
Check for loose or corroded con-
nections.
Check for voltage at any instru-
ment using a Voltmeter.
Turn ignition switch to “Run” po-
sition.
DO NOT start engine.
Check for pinched or severed
wires.
Check all trim harness connec-
tors for loose or corroded con-
nections.
Check trim switch.
Connect Voltmeter red lead to
Point 3 and black lead to ground,
Battery voltage should be indi-
cated.
There is an open circuit in wire be-
tween Point 5 and Red terminal on
the back of the ignition switch.
Red wire is open between Point 3
and red terminal on back of the ig-
nition switch.
Check that voltage is being
supplied to control by performing
the following checks:
Connect red Voltmeter lead to
Point 5, and black lead to ground.
Trim switch is faulty or there is an
open circuit in wires (green-white,
blue-white) between trim buttons
and trim pump.
MID-SECTION - 5D-1390-817643R1 DECEMBER 1996
Troubleshooting the “Down” and
“Up” Circuits (All Circuits
Inoperative)*
*Remote Control NOT Equipped with Trailer
Button

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