90-824052R3 JUNE 2002 MID-SECTION - 5B-9
ELECTRICAL SYSTEM TROUBLESHOOTING
CONDITION OF TRIM SYSTEM PROBLEM
A. Trim motor does not run when
trim button is depressed.
1, 2, 4, 5,
6, 7, 8
B. Trim system trims opposite of
buttons.
3
C. Cowl mounted trim buttons do
not activate trim system.
2, 4, 5, 6, 7
PROBLEM
1. Battery low or discharged.
2. Open circuit in trim wiring.
3. Wiring reversed in remote control.
4. Wire harness corroded through.
5. Internal motor problem (brushes, shorted
armature).
6. Blown fuse(s).
7. Trim switch failure.
8. Verify relays are functioning correctly.
POWER TRIM RELAY TEST PROCEDURE
The trim motor relay system used on permanent
magnet trim systems connect each of the two wires
from the trim motor to either ground or positive in
order to allow the motor to run in both directions.
If the motor will not run in the UP direction, it could be
either the UP relay is not making contact to 12 volts
OR the DOWN relay is not making contact to ground.
The opposite is true if the system will not run DOWN.
When the system is not energized, both relays
should connect the heavy motor leads to ground.
To test which relay is faulty if the trim system does not
operate in one direction:
1. Disconnect the heavy gauge pump wires from
the trim control relay.
2. Check for continuity between the heavy leads
from the trim relays to ground.
Ohmmeter
Leads Between
Resistance
(Ohms)
Scale Reading
(R x 1)
GREEN and
Ground
0 Full Continuity
(Rx1)
BLUE and Ground
0
Full Continuity
(Rx1)
Replace the relay that does not have continuity.
3. Connect a voltmeter to the heavy BLUE lead and
to ground. You should have 12 volts on the BLUE
lead when the UP switch is pushed. You should
should also have 12 volts on the GREEN lead
when the DOWN switch is pushed. Replace the
relay that does not switch the lead to positive.
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