Main Menu
Newest Members
ntxduffer, OKBlindHogg, TDog301, Chris N USMC, laserbeak
108021 Registered Users
Top Posters
TexDawg 88641
hopalong 78895
Pilothawk 76394
John175® 67597
JDavis7873® 67390
FattyMcButterpants 60868
Derek 🐝 60284
Tritonman 57993
LoneStarSon® 54406
SkeeterRonnie 53367
Forum Stats
108021 Members
60 Forums
861336 Topics
12275740 Posts

Max Online: 36273 @ 01/23/13 02:34 PM
Topic Options
#10993666 - 07/22/15 01:20 PM Need help with trim Tabs
CharlieA Offline

Registered: 02/24/13
Posts: 80
Loc: Dayton, Texas
Something happened to my trim tabs that caused them to only one tab on the right side will go one way. I can hear solenoids clicking but the pump is not running for the other three positions. Any help would be appreciated
Of all the things I've lost, I miss my mind the most !!

#10993963 - 07/22/15 03:23 PM Re: Need help with trim Tabs [Re: CharlieA]
militarybrat Offline
Extreme Angler

Registered: 06/02/11
Posts: 2698
Loc: dalllas texas
I'm frustrated by someone calling RELAYS solenoids they are 2 different things. That said find the relays replace both if there are 2 one for each side check the wiring to both as corrosian will cause this also. Easy thing to fix if you know what to look for. You can also swap them to see if the problem switches sides if it does I personally would replace both. You may find a connector unplugged also check all wire connections to the relays. Also check to make sure the wire connections at the switches are secure and not disconnected from the switchs.

Edited by militarybrat (07/22/15 03:27 PM)
Who ever said nothing in life is impossible.
Never tried slamming a revolving door.

#10998355 - 07/24/15 11:59 AM Re: Need help with trim Tabs [Re: CharlieA]
Tabman Offline
Green Horn

Registered: 07/23/15
Posts: 2
What brand of Trim Tabs are they?

It sounds like it it could be a switch problem

If they are Bennett take a look at this video

If they are another brand let me know.

Take a look at step 3 below, it will walk you through the test I think will isolate your problem. Make sure that ALL the screws are tight on the back of the switch even if they don't have a wire attached, this could be your problem.

Let me know what you find and I will walk you through fixing it.

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


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:
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).

#10999228 - 07/24/15 08:25 PM Re: Need help with trim Tabs [Re: militarybrat]
Tabman Offline
Green Horn

Registered: 07/23/15
Posts: 2
Actually most hydraulic Trim Tab systems have two solenoid valves that control the fluid going the the actuators (rams). They may or may not have relays.

Bennett Marine

#11013600 - 08/01/15 10:55 AM Re: Need help with trim Tabs [Re: CharlieA]
CharlieA Offline

Registered: 02/24/13
Posts: 80
Loc: Dayton, Texas
Yhanks to everyone who posted. it ended up being a switch problem and was corrected with repacing the switches. thanks again to everyone for you input. Charlie
Of all the things I've lost, I miss my mind the most !!


© 1998-2018 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide