On Board Air Compressor Wiring Diagram

An on board air compressor system provides convenient access to compressed air for various applications, from inflating tires to powering air tools. A crucial element of any such system is the on board air compressor wiring diagram. Understanding this diagram is paramount for safe and effective installation, operation, and troubleshooting. This article provides a detailed overview of these diagrams, their components, and practical application.

Benefits of Understanding Your Wiring Diagram

• Safe Installation: Correct wiring prevents damage to the compressor and vehicle electrical system.
• Effective Troubleshooting: Diagnosing issues becomes significantly easier with a clear understanding of the wiring layout.
• System Optimization: Properly wired systems ensure optimal performance and longevity of the compressor.
• DIY Confidence: Enables users to perform basic maintenance and repairs independently.

Key Components of an On Board Air Compressor Wiring Diagram

A typical on board air compressor wiring diagram will include several key components. Familiarizing yourself with these elements is crucial for successful implementation and repair.

• Power Source: Typically the vehicle’s battery, requiring appropriate gauge wiring and a fuse or circuit breaker.
• Compressor Motor: The electrical motor responsible for compressing the air.
• Pressure Switch: Controls the compressor’s operation, turning it on/off based on air pressure in the tank.
• Relay: An electrically operated switch that allows a low-current circuit (like the pressure switch) to control a high-current circuit (the compressor motor).
• Wiring: Wires of appropriate gauge (thickness) to handle the current load.
• Fuse/Circuit Breaker: Protects the system from overcurrent situations.
• Ground Connection: A secure connection to the vehicle’s chassis to complete the electrical circuit.
• Air Tank (Optional): A reservoir for storing compressed air.
• On/Off Switch (Optional): An additional switch for manual control of the compressor.

Practical Application and Wiring Diagram Interpretation

When examining an on board air compressor wiring diagram, pay close attention to the symbols used to represent each component. Common symbols include circles for motors, rectangles for relays, and zig-zag lines for resistors. Note the wire colors and gauges specified in the diagram. Follow these steps for proper installation:

1. Identify Components: Match each component in the diagram to its physical counterpart.
2. Wire Gauge Selection: Select wires of the appropriate gauge based on the compressor’s amperage draw. Use heavier gauge wire for longer runs to minimize voltage drop.
3. Power Connection: Connect the positive wire from the battery to the relay, with an inline fuse or circuit breaker close to the battery.
4. Relay Wiring: Wire the pressure switch and any optional on/off switch to the relay’s control circuit. Connect the relay’s output to the compressor motor.
5. Grounding: Ensure a solid ground connection between the compressor, relay, and vehicle chassis.
6. Testing: After wiring, test the system by manually activating the pressure switch (or using an on/off switch, if present) to ensure the compressor operates correctly.

1. Troubleshooting Common Issues

Understanding the on board air compressor wiring diagram will greatly assist in troubleshooting problems. Here are some common issues and their potential causes:

• Compressor Not Turning On: Check the fuse, pressure switch, relay, wiring connections, and ground.
• Compressor Runs Continuously: Possible faulty pressure switch or a leak in the air system.
• Slow Air Delivery: Check for leaks, restrictions in the air line, or a weak compressor.
• Fuse Keeps Blowing: Indicates an overcurrent situation. Check for shorts in the wiring or a faulty compressor motor.

2. Tips for Wiring Success

• Use Quality Wiring: Invest in high-quality, properly insulated wiring.
• Proper Connections: Use crimp connectors and heat shrink tubing for secure and weather-resistant connections.
• Follow the Diagram: Adhere strictly to the on board air compressor wiring diagram provided with your compressor.
• Safety First: Disconnect the vehicle’s battery before working on the electrical system.
• Professional Help: If unsure, consult a qualified automotive electrician.

FAQs About On Board Air Compressors and Wiring

Q: What size fuse do I need for my on board air compressor?

A: The fuse size depends on the compressor’s amperage draw. Consult the compressor’s specifications for the recommended fuse size. Typically, a 30-amp or 40-amp fuse is common for many models.

Q: Can I wire my on board air compressor directly to the battery?

A: While possible, it is generally not recommended. Using a relay is safer, as it allows a low-current circuit to control the high-current compressor motor. This protects the pressure switch and other low-current components.

Q: What gauge wire should I use for my on board air compressor?

A: The appropriate wire gauge depends on the compressor’s amperage draw and the length of the wire run. Consult a wire gauge chart to determine the appropriate size. Generally, 10-gauge or 12-gauge wire is suitable for many compressors.

Q: Where should I mount my on board air compressor?

A: Choose a location that is protected from the elements, well-ventilated, and easily accessible for maintenance. Consider the proximity to the battery and the air tank (if used).

Q: How important is a proper ground connection?

A: A proper ground connection is crucial for the proper functioning of the compressor and the safety of the electrical system. Ensure the ground connection is clean, tight, and connected to a solid metal part of the vehicle’s chassis.

Conclusion

The on board air compressor wiring diagram is the roadmap to a successfully installed and functioning on-board air system. A thorough understanding of the diagram’s components and layout allows for safe installation, efficient troubleshooting, and optimized performance. By following the principles outlined above, users can confidently manage their on-board air compressor system and enjoy the benefits of readily available compressed air.