
Installing an electric dump valve is a straightforward process that can be done by following a few simple steps. While the exact procedure may vary slightly depending on the specific valve and vehicle, the basic principles remain the same. This process typically involves preparing the mating surfaces, mounting the valve, connecting the electronic control switches, and wiring the power source. Some common tools and parts required for this process include gaskets, lubricants, nuts and bolts, a multimeter tool, data cables, and a power source. It is important to consult the product manual and seek guidance from manufacturers and online forums to ensure a smooth installation process.
Characteristics and Values of Fitting an Electric Dump Valve
| Characteristics | Values |
|---|---|
| Required Parts | Electric valves, control switches, cabling, installation hardware, gaskets, 111 Compound, nuts and bolts, 12-volt Haldex Electric Solenoid Valve, single-pole toggle switch, 12-gauge wire and connectors, 0.25-in. 90-degree pipe elbow, brass straight nipple, liquid Teflon thread sealant |
| Installation Steps | Clean and inspect mating surfaces, attach gaskets to flange, apply 111 Compound to valve blade surfaces, slide valve between flanges and secure with nuts and bolts, mount switch, connect data cables to valves and switches, run 12-volt power cable, test the system |
| Challenges | Dealing with sticking manual valves, ensuring correct positioning of the motor, accessing the valve for maintenance or repair |
| Benefits | Easier waste tank dumping, increased storage space, no need to deal with manual push/pull rod valves, improved convenience with electronic control switches |
| Cost | Quality electric valves can be expensive, but a manual dump valve can be installed for less than $100 |
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What You'll Learn

Prepare mating surfaces
To prepare the mating surfaces, start by thoroughly cleaning the flanges of the trailer's sewer piping and carefully inspecting them for any cracks or chips. Ensure that the mating surfaces are free of any defects or damage before proceeding. Cleanliness and attention to detail are crucial to ensure a proper seal and prevent leaks.
Once the mating surfaces are clean and inspected, it's time to apply the necessary compounds and gaskets. Start by attaching the supplied gaskets to the flanges, following the manual's instruction to not attach them to the electric valve during assembly. Position the gaskets securely in place, ensuring they are aligned correctly with the flanges.
Next, apply the supplied compound to the valve blade surfaces. In this case, the compound is Dow Corning Molycote 111, which acts as a lubricant and aids in reducing friction and wear. Spread the compound evenly on both sides of the valve blade, ensuring complete coverage.
After applying the compound, carefully slide the electric valve into position between the flanges. Gently work the pieces together, using a slight twisting motion to seat the gaskets properly. Ensure that the valve is securely seated and aligned correctly within the assembly.
Finally, secure the assembly with the provided nuts and bolts. Tighten them in a cross pattern, ensuring an even and secure fit. This step ensures that the mating surfaces are firmly held together, preventing leaks and ensuring the structural integrity of the joint.
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Install with the motor facing up
When installing an electric dump valve with the motor facing up, there are several important steps to follow. Firstly, ensure you have all the necessary components, including the electric dump valve, wiring harness, and vacuum hose. The specific installation process may vary slightly depending on the vehicle and dump valve model, but here is a general guide:
Begin by locating the appropriate mounting location for the electric dump valve. Typically, this will be in close proximity to the turbocharger or the wastegate actuator. Ensure that the chosen location provides adequate clearance for the motor and that the dump valve is securely fastened to a solid mounting point. With the dump valve in position, you can now connect the vacuum hose to the valve. This hose will route to the intake manifold or a suitable vacuum source. It is important to ensure that the hose is securely attached and sealed to maintain vacuum pressure.
The wiring process is crucial. Connect the wiring harness of the electric dump valve to a power source and switch. Ensure that the wiring is routed safely and securely, away from any moving or high-temperature components. A common practice is to connect the wiring to the ignition feed, allowing the dump valve to activate only when the engine is running. However, some users may prefer a manual switch to control the valve independently.
Finally, with the dump valve installed, test its operation. Start by starting the engine and allowing it to idle. With the dump valve activated, you should hear the distinctive sound of air being vented. Ensure that the wastegate operates correctly and that there are no leaks in the vacuum system. Fine-tune the dump valve's settings according to your preferences, ensuring consistent function across different engine speeds and load conditions.
By following these steps and adhering to the specific instructions provided with your electric dump valve kit, you can successfully install the dump valve with the motor facing up, ensuring reliable and responsive boost control for your turbocharged engine.
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Connect control switches
When connecting control switches for an electric dump valve, it is important to follow the correct procedures and take into account the specific components and configurations of your vehicle. Here is a step-by-step guide to help you through the process:
Firstly, locate the dump valve, which is usually found somewhere around the back axle. Follow the air lines from the rear air bags to the dump valve. The dump valve will typically have two wires: one for power and one for the ground connection. Identify the power wire and carefully trace it towards the front of the vehicle. This will be the wire you work with to establish the necessary connections.
In the cab of the vehicle, you may have a switch specifically for the dump valve. If you do not have a dedicated switch, you will need to run your own power supply from the body controller to the switch. This can be a complex process, and it is recommended to consult a professional or refer to vehicle-specific instructions for guidance.
Once you have identified the relevant wires, you can proceed with making the electrical connections. Ensure that the ignition is off before beginning any electrical work. Connect the wire from the rear of the truck to the corresponding wire in the cab. Depending on your vehicle's configuration, you may need to connect it to the wire from the second plug. It is important to verify that your connections are secure and aligned with the vehicle's electrical system.
After completing the connections, you can test the setup. Power the plug for the dump valve and then locate the valve itself to verify its operation. Ensure that the buzzer is wired correctly and is activated when the switch is flipped. Additionally, test the dump valve with a 12V battery or a drill battery to confirm its functionality.
Finally, refer to your vehicle's specific instructions or consult a mechanic to ensure that you have followed all the necessary steps for your particular make and model. This may include additional steps, such as configuring parameters related to air suspension and chassis control.
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Run 12-volt fused wiring
After mounting the switch, it is time to run 12-volt fused wiring to the switch and valve. The wiring should be fused and run from the battery compartment to the switch and valve. It is recommended to use a battery closer to the setup, instead of the main power distribution panel, to avoid running long cables.
For instance, in the case of an RV, the battery compartment is about 5 feet away, while the main power distribution panel is 15 feet away. Hence, running a cable from the battery compartment is a better option.
The wiring should be 12-gauge wire, and the setup should also have a 12-volt Haldex Electric Solenoid Valve. A single-pole toggle switch should be used to operate the valve.
It is important to ensure that the wiring is properly fused and connected to avoid any electrical issues or short circuits. Fuses are essential to protect the electrical system and prevent damage in case of a power surge.
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Test the system
Testing the system is a crucial step in the installation process. This step involves activating the toggle switch to trip the dump valve and observing its response. When the switch is activated, the dump valve should instantly release suspension pressure, leading to a decrease in pressure. It is important to position the toggle switch downwards during this process to correlate with the suspension movement.
To ensure the system is functioning correctly, pay attention to the suspension movement and make sure it corresponds with the toggle switch's position. This testing phase helps verify that the dump valve is operating as intended and that the pressure release is immediate.
Additionally, during the testing phase, it is important to be vigilant for any signs of pressure build-up or abnormal behaviour. If the suspension pressure does not release as expected, it may indicate an issue with the installation or the dump valve itself. In such cases, it is advisable to re-check the installation steps, ensure that all connections are secure, and verify that the dump valve is properly seated and functioning.
The testing process is a critical safety measure as it ensures that the dump valve system is functioning correctly and can be relied upon when needed. It provides confidence that the system will perform as intended, preventing potential issues or failures when the dump valve is operated under normal conditions.
By thoroughly testing the system, you can identify any potential problems and make the necessary adjustments or corrections before finalising the installation. This proactive approach helps ensure the reliability and safety of the dump valve system, making it a crucial step in the overall installation process.
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Frequently asked questions
You will need a 12-volt Haldex Electric Solenoid Valve, a single-pole toggle switch, 12-gauge wire and connectors, a 0.25-inch 90-degree pipe elbow, a 0.25-inch straight nipple, and liquid Teflon thread sealant.
First, disconnect the feed lines to the air bags from the T fitting on the HCV. Remove the T fitting, coat the threads with Teflon sealant, and rethread into the “inlet” port on the Haldex Electric Solenoid Valve. Attach the dump valve to the HCV and reconnect the air suspension feed lines to the T fitting. Install and tighten four bolts, then mount the switch and run 12-volt fused wiring to the switch and valve.
The optimal position for installing electric valves is with the motor facing up, straight up and down, or within a 10 and 2 o'clock range.










































