---
Understanding Bennett Trim Tabs and Their Wiring System
Bennett trim tabs are electro-hydraulic devices installed on the transom of a boat, allowing the operator to adjust the angle of the tabs to optimize the boat's attitude on the water. The wiring system for Bennett trim tabs is designed to connect the control switch, power source, and hydraulic actuator, enabling precise and responsive adjustments.
Components of a Bennett Trim Tab Wiring System
A typical Bennett trim tab wiring system includes the following components:
- Control Switch: Usually mounted on the dash, allowing the operator to adjust the trim tabs up or down.
- Wiring Harness: Connects the control switch to the hydraulic actuators and power source.
- Hydraulic Actuators (Motors): Power the movement of the trim tabs.
- Power Supply: Usually a 12V DC power source from the boat's electrical system.
- Relay or Control Module: Manages the electrical signals and ensures safe operation.
- Fuses or Circuit Breakers: Protect the system from electrical overloads.
---
Interpreting the Bennett Trim Tab Wiring Diagram
A Bennett trim tab wiring diagram visually represents the connections between all components involved in the system. Understanding this diagram is crucial for correct installation and troubleshooting.
Key Elements of the Wiring Diagram
- Labels and Symbols: Recognize symbols for switches, relays, motors, and power sources.
- Color Coding: Wires are often color-coded for easy identification (e.g., red for positive, black for negative).
- Connection Points: Marked terminals where wires connect to switches, relays, and actuators.
- Ground Connections: Usually indicated with a ground symbol, essential for completing the electrical circuit.
Common Wiring Diagram Layout
A typical Bennett trim tab wiring diagram includes:
1. Power source (battery or boat's electrical system).
2. Fused circuit to protect against overload.
3. Control switch connected to the relay/control module.
4. Relay or control module directing power to the hydraulic actuators.
5. Hydraulic actuators connected to the trim tabs.
6. Ground connections for all components.
---
Step-by-Step Guide to Bennett Trim Tab Wiring
Correct wiring ensures safe operation and longevity of your Bennett trim tabs. Follow these steps carefully:
Tools and Materials Needed
- Wire strippers and crimpers
- Electrical tape or heat shrink tubing
- Screwdrivers
- Multimeter
- Wiring harness (specific to Bennett system)
- Fuses or circuit breakers
- Control switch (inline or panel-mounted)
Installation Procedure
1. Turn Off Power: Always disconnect the boat’s battery before beginning any wiring work.
2. Identify Components: Gather all components – control switch, hydraulic actuators, wiring harness, power supply.
3. Connect Power Supply:
- Attach the positive (red) wire from the power source to the fuse or circuit breaker.
- Connect the fuse/circuit breaker to the control switch and relay.
- Connect the negative (black) wire to a good grounding point on the boat’s chassis.
4. Wire the Control Switch:
- Connect the switch’s output terminals to the relay or control module as specified in the wiring diagram.
- Ensure the switch is mounted securely in an accessible location.
5. Connect Hydraulic Actuators:
- Attach the wires from the relay/control module to the hydraulic actuators.
- Confirm that the positive and negative wires are correctly connected to avoid reverse operation.
6. Ground Connections:
- Connect all ground wires to a common grounding point.
- Use proper grounding techniques to prevent electrical noise and ensure system stability.
7. Secure All Connections:
- Use crimp connectors or soldering for reliable connections.
- Insulate all exposed wires with electrical tape or heat shrink tubing.
8. Test the System:
- Reconnect the boat’s battery.
- Turn on the control switch and verify that the trim tabs respond correctly.
- Use a multimeter to check voltage at various points to ensure proper wiring.
---
Common Wiring Diagrams for Bennett Trim Tabs
Different models of Bennett trim tabs may have slightly varied wiring diagrams, but the core principles remain the same. Here are some common configurations:
Standard Bennett Trim Tab Wiring Diagram
- Power from the boat’s 12V system feeds into a fuse and then to the control switch.
- The switch controls the relay, which in turn powers the hydraulic actuators.
- Ground wires connect all components to the boat’s chassis ground.
- The system includes a relay for each trim tab, allowing independent control.
Dual Trim Tab Wiring Diagram
- For boats with two trim tabs, the wiring diagram incorporates two control switches and relays.
- Each tab's actuator is wired independently for precise control.
- Optional features include automatic leveling or joystick control, which involve additional wiring and control modules.
---
Troubleshooting Wiring Issues in Bennett Trim Tabs
Even with correct wiring, issues can arise. Here are some common problems and solutions:
Symptoms of Wiring Problems
- Trim tabs not responding to switch commands.
- No power to hydraulic actuators.
- Erratic or inconsistent movement.
- Blown fuses or circuit breakers.
Troubleshooting Steps
1. Check Power Supply:
- Use a multimeter to verify voltage at the fuse and control switch.
2. Inspect Connections:
- Ensure all wires are securely connected and free of corrosion.
3. Test the Switch:
- Use a multimeter to confirm the switch is functioning correctly.
4. Examine Relays and Control Modules:
- Listen for clicking sounds or test relay coils for continuity.
5. Verify Grounding:
- Ensure all ground connections are solid and free of rust or paint.
6. Replace Faulty Components:
- Swap out damaged relays, switches, or actuators as needed.
---
Additional Tips for Installing Bennett Trim Tab Wiring System
- Always use the recommended gauge of wiring to handle the current load.
- Route wires away from moving parts and heat sources.
- Use waterproof connectors and seal all connections to prevent corrosion.
- Label wires during installation for easier future troubleshooting.
- Follow manufacturer instructions specific to your Bennett trim tab model.
---
Conclusion
A well-understood and correctly implemented Bennett trim tab wiring diagram is fundamental for achieving smooth, responsive control of your boat's trim system. Whether you're installing, repairing, or upgrading your trim tabs, paying close attention to wiring details ensures safety, performance, and longevity. Remember, always follow the manufacturer's instructions, use appropriate tools and materials, and prioritize safety during installation. With a clear wiring diagram and proper execution, your Bennett trim tabs will serve you reliably for years to come, enhancing your boating experience with better stability and efficiency.
Frequently Asked Questions
What is the purpose of the Bennett Trim Tab wiring diagram?
The wiring diagram provides a detailed schematic for correctly connecting the electrical components of Bennett trim tabs, ensuring proper operation and troubleshooting.
Where can I find the Bennett trim tab wiring diagram for my boat model?
You can find the wiring diagram in the boat’s owner’s manual, on Bennett Marine’s official website, or by contacting a certified dealer or service technician.
What are the common components shown in the Bennett trim tab wiring diagram?
Common components include the trim tab switch, hydraulic pump, solenoid, power source, and wiring harnesses that connect these elements.
How do I interpret the wiring connections in the Bennett trim tab diagram?
The diagram uses standard symbols and color codes to indicate connections between switches, pumps, relays, and power sources, helping you trace and verify wiring setups.
Can I troubleshoot Bennett trim tab issues using the wiring diagram?
Yes, the wiring diagram helps identify wiring faults, loose connections, or faulty components related to trim tab operation, facilitating effective troubleshooting.
Is it necessary to disconnect power before referencing the Bennett trim tab wiring diagram?
Absolutely. Always disconnect power before inspecting or working on the wiring to prevent electrical shock or damage.
What tools are recommended for wiring Bennett trim tabs according to the diagram?
Tools such as wire strippers, crimpers, multimeter, screwdrivers, and marine-grade wiring are recommended for proper installation and troubleshooting.
Are there differences in Bennett trim tab wiring diagrams for different boat sizes or models?
Yes, wiring diagrams can vary based on boat size, model, and electrical configuration; always use the specific diagram for your boat model.
How often should I review or update my Bennett trim tab wiring connections?
Periodically inspect wiring connections at least once a season or after any electrical work to ensure reliable operation and prevent corrosion.
Who should I contact if I have difficulty understanding the Bennett trim tab wiring diagram?
Contact a qualified marine electrician or Bennett Marine customer support for assistance with interpreting or troubleshooting wiring diagrams.
