Relay Testing
When the trim-UP button is pressed, the UP relay is energized and connects the blue trim motor wire to the battery positive (+) terminal. The green trim motor wire remains grounded. When the button is released, the blue trim motor wire returns to a grounded position.
When the trim-DOWN button is pressed, the DOWN relay is energized and connects the green trim motor wire to the battery positive (+) terminal. The blue motor wire remains grounded. When the button is released, the green trim motor wire returns to a grounded position.
Refer to TILT/TRIM RELAY TEST on p. 138 for relay testing procedure.
Trim and Tilt Motor Current Draw Tests
Careful analysis of the electric motor's current draw and trim/tilt unit operating speed aids evaluation of the electric motor and certain mechanical components.
Use a battery rated at 360 CCA (50 Ah) or higher that is in good condition and fully charged to perform this test.
IMPORTANT: Specifications are for static hydraulic tests. DO NOT attempt to perform the following tests while the boat is moving.
Connect a 0 to 100 A DC ammeter in series between the battery side of the starter solenoid and the red lead to the trim/tilt relay module.
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- Red lead
Observe ammeter and a stopwatch while running hydraulic unit through several complete cycles.
Compare test results to the values listed:
| Mode | Normal Current Draw | Time in Seconds |
|---|---|---|
| Stall UP | 11 to 16 Amps | – |
| Stall DOWN | 16 to 22 Amps | – |
| Full Range UP | – | 13 to 19 |
| Full Range DOWN | – | 10 to 16 |
Test results include three basic possibilities:
A. Low current draw – Check for:
• Valves leaking
• Pump damaged
• O-rings leaking
• Manual release valve damaged
B. High current draw – Check for:
• Valves sticking
• Pump binding
• Motor binding
• Cylinder binding
C. Normal current draw, slow operating speed – Check for:
• Manual release valve damaged
Trim and Tilt Motor No Load Test
IMPORTANT: Securely fasten motor in a suitable fixture before proceeding with this test.
Use a battery rated at 360 CCA (50 Ah) or higher that is in good condition and fully charged to perform this test.
Connect a 0 to 25 A ammeter in series with the battery positive (+) terminal, ammeter red lead toward terminal.
Attach or hold a vibration or mechanical tachometer to the motor while performing this test.
Monitor motor RPM and current draw.
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The motor shaft must rotate clockwise, as viewed from the pump end, when positive (+) is applied to the blue lead, and negative (–) is connected to green lead.
The motor shaft must rotate counterclockwise, as viewed from the pump end, when positive (+) is applied to the green lead, and negative (–) is applied to the blue lead.
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If test results vary, replace the motor.
Trim Gauge Test
STEP 1
Turn key switch ON. Using a voltmeter, check for voltage between the trim gauge “I” and “G” terminals.
• If no voltage, check condition of instrument harness, key switch, and engine 20 A fuse.
• If voltage is shown, go to STEP 2.
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STEP 2
Remove the white/tan lead from the trim gauge “S” terminal. With key switch ON, gauge should indicate full-trim DOWN position. Now connect a jumper wire between terminals “S” and “G.” Gauge should indicate full-trim UP position.
• If results are different, replace the trim gauge.
• If results agree, refer to Trim Sender Test.
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Trim Sender Test
IMPORTANT: To avoid immediate meter damage, never apply an ohmmeter to an electrical circuit where voltage is present.
Disconnect the 3-pin connector between the instrument harness and engine trim harness. Connect an ohmmeter between the white/tan wire, terminal “C,” of the engine harness and a clean engine ground.
With the outboard fully DOWN, meter must show a reading above 80 ohms.
With the outboard fully UP, meter must show a reading below 10 ohms.
• If results agree, refer to Trim Gauge Test on p. 304.
• If results are different, replace trim sender.
Trin and Tilt Service
Removal
Raise the outboard and engage the tilt support.
Remove the rubber grommet from the blue/green trim/tilt cable connector.
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Remove the terminals from the connector by using a suitable tool to depress the tab. While the tab is depressed, pull on the wire from the rear of the connector to release it from the connector.
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Separate the trim/tilt unit wires in the braided tube to permit removal through the hole in the stern bracket.
