BASICS OF THE V351 Bennet trim Tab
WIRING. Harness colors and functions:
Red Port Valve
Green Starboard Valve
Blue Pump Pressure
Yellow Pump Retract
Black - Ground
orange + power ( 20 amp fuse )
Control is marked on bottom for color coding.
Markings on top of control refer to hull action. When the toggle is moved
to port down, for example, the starboard trim plane lowers which in turn lowers the
port side of the bow. Thus, when under way, the operator merely moves the control toggle
in the direction of the high quarter of the boat and that quarter lowers.
Mount pump as high and a close to transom a possible. Water can enter the trim pump
reservoir, if submerged. Be sure to leave clearance for tubing, as it doesn't make tight
bends very well. Use metal tubing supports, supplied with kit, if tight
bends are required.
Facing pump, the left side goes to port (left) actuator, right to starboard. Note that
solenoid valve wire on left is red and right valve wire is green matching the navigation
light colors -- easy to remember.
Fill with DEXRON transmission fluid. Just run up and down a few times to bleed. Check for
leaks. ( recheck level after a few uses out on the water)
TESTING FUNCTION OF CONTROL.
(Refer to color coding above and it will clarify the following.) Remove
wires from control. Touching the positive lead to the colors as shown at left should
provide results as shown at right.
Positive with blue & red
Port plane down
Positive with blue & green
Starboard plane down
Positive with blue, red & green Both down
Positive with yellow & red
Positive with yellow & green Starboard
Positive with yellow, red & green Both up simultaneously
If the opposite plane moves to that described above, the tubing is reversed at the
The control toggle operates through an arc of about 45o in the "both-up" and "both-down" positions
(about 20o-25o either side of straight forward or straight aft). To get one
plane only, the toggle should be moved to the 45o marks on the control.
If trim planes go down but will not come up, it is normally caused by low voltage. To
ascertain low voltage, check voltage while pump is running with a voltmeter at the pump
end of the wires. If the voltage is less than 9V, the valves will not open.
Although infrequent, water can enter the trim tab system. The two
possible sources for water entry are:
* The pump is submerged in bilge water.
* The seals in the trim rams have started to leak.
It is a good idea to periodically check the fluid for water
entry. The normally translucent reddish color of Dexron fluid will
change to a strawberry milk shake color.
Tip: Retracting the trim tabs, when not in use, can help protect the
trim rams from damage and marine growth.
Although the trim tabs themselves do not typically require anodic zinc
protection; zinc disks should be installed, on the stainless steel
tab, to help reduce corrosion of surrounding, more sensitive,
Parts blow-up of Bennet pump
Telephone help may be obtained by calling Bennet Customer Service at:
954-427-1400 Fax: 954-480-2897
Bennett Marine's Client Services
Department May Be Reached From 8:00 AM - 5:00 PM Eastern Time,
Monday - Friday