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Trim Tabs Not working.

Old 06-28-2012, 05:12 PM
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Does anyone have the wiring info for the Bennett style trim tab pump? thanks!
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Old 06-28-2012, 05:23 PM
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Originally Posted by BlownFountain View Post
Does anyone have the wiring info for the Bennett style trim tab pump? thanks!

BlownFountain,

Here is a link to a video that covers the basic system and general troubleshooting http://www.bennetttrimtabs.com/videoplayer.php?vID=10

Below you will find troubleshooting that includes the wiring information for the system.

Let me know if I can be of any help.

Tom McGow
Bennett Marine

Fluid: Automatic Transmission Fluid (ATF) any type. Hydraulic Power Unit is self bleeding, running the Trim Tabs up and down 3-4 times will purge air from the system.

Fuse: 12 volt system use 20 amp in-line fuse on positive. (24v & 32v use proportionately smaller)

Red= Port Valve
Green= Starboard Valve
Blue=Motor Forward (pump pressure)
Yellow= Motor Reverse (pump retract)
Black on HPU=Ground
Orange on Helm=Control Positive

Troubleshooting

1.If one side is not operating reverse hydraulic lines on the front of the Hydraulic Power Unit to determine if the malfunction is in HPU or actuator / hydraulic lines. If after reversing the lines symptom shifts to the other side the malfunction may exist in HPU. If the symptom remains on the same side, malfunction may exist with the actuator / hydraulic lines

2. Is the unit receiving a solid 12 volts? Low voltage will some times cause the solenoids to not open preventing the tabs from moving even though the pump motor is running.

3. Conduct the following test:
Remove the wires from the helm control and touch together as follows:
Operation=Reaction
Orange (+), blue, red= Port trim tab down
Orange (+), blue, green=Starboard trim tab down
Orange (+), blue, red, green= Both trim tabs down
Orange (+), yellow, red= Port trim tab up
Orange (+), yellow, green=Starboard trim tab up
Orange (+), yellow, red, green= Both trim tabs up

If the trim tabs function correctly for each wire grouping then the switch is at fault. Also note that any loose or missing screws on the back of the switch (whether a wire is connected there or not) can cause the pump to malfunction.

This test may also be done right at the pump by substituting a "hot lead" for orange. There is usually a connector to the wire harness within a foot or so of the pump. You want to check this connection for corrosion. You may wish to cut the connector off on the pump side and try the test on bare wires.

4. If you suspect corrosion on the wire connector near the pump, cut it out, test as above and reconnect using butt splices.

5. If you conclude the problem is in the pump, contact me. Bennett Trim Tab Systems carry a five year warranty.

6. Check to see if there is a relay in line on the wiring harness near the hydraulic power unit. If there is it is an Interrupter Relay (IR1000). It prevents the system fuse from blowing if you try to actuate one trim tab up and the other down at the same time. After you test as outlined above, try removing the relay from the wiring harness and retest the unit.(Note: the interrupter relay is no longer used in current Bennett Trim Tab systems and has been replaced with a Switches that "lock out" preventing a blown fuse).
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Old 06-29-2012, 05:57 PM
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That's great info!! Thanks so much.
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Old 05-31-2020, 07:01 AM
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Originally Posted by Tabman View Post
Josh,

Do you know what brand your Trim tabs are? Let me know, and I can help, even if they are not Bennett.

Tom McGow
Bennett marine

Hello guys am new here , my trim tabs switch is not working. I am getting powee to the switch.
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Old 12-12-2020, 09:18 PM
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Can anyone advise on whether stainless trim tabs should be antifouled with regular hull antifoul, or copper free sterndrive antifoul?

Also, should the trim tab bracket have the 25mm clean border around it as per the transom shield?
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Old 12-14-2020, 10:54 PM
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Can anyone advise on whether stainless trim tabs should be antifouled with regular hull antifoul, or copper free sterndrive antifoul?

Also, should the trim tab bracket have the 25mm clean border around it as per the transom shield?
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Old 12-31-2020, 02:13 AM
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Can anyone advise on whether stainless trim tabs should be antifouled with regular hull antifoul, or copper free sterndrive antifoul?

Also, should the trim tab bracket have the 25mm clean border around it as per the transom shield?
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Old 01-08-2021, 12:56 AM
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Can anyone advise on whether stainless trim tabs should be antifouled with regular hull antifoul, or copper free sterndrive antifoul?

Also, should the trim tab bracket have the 25mm clean border around it as per the transom shield?
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Old 01-16-2021, 07:08 PM
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Can anyone advise on whether stainless trim tabs should be antifouled with regular hull antifoul, or copper free sterndrive antifoul?

Also, should the trim tab bracket have the 25mm clean border around it as per the transom shield?
WilliamLopay is offline  
Old 01-17-2021, 07:45 AM
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I need to make trim tabs to aid in trimming my 30 Dumas Hawker Hurricane. What is the best way to make them? I have had a hard time finding something that will hold the angle I set it to. Thanks for any help.

Dave
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