The Chassis Electric system of the HOWO A7 8X4 integrates sensors, valves, relays, fuses, horns, and mounting hardware to ensure reliable electrical and pneumatic control. This comprehensive parts list includes the Electronic barometric sensor, Stand, Magneticvabe (valve), Relay(20A), 100A fusion device, Horn, Cross screws, Spring washer, Hexbolt, Springwasher & Flatwasher combination, I shape Hexagonal nut, Air pressure signal lamp switch, and Crosscrew along with additional fasteners. Every component is designed for durability and precise fitment. When you select genuine howo Parts, you ensure that your chassis electric and pneumatic systems operate with maximum efficiency and safety.
The Electronic barometric sensor measures atmospheric pressure and provides real-time data to the engine control unit. It helps optimize fuel injection and turbocharger response.
This sensor uses a piezo-resistive element and is sealed against moisture and dirt. It is mounted on the chassis frame via a dedicated stand.
The Stand is a sturdy metal bracket that securely holds the electronic barometric sensor and other components. It absorbs vibration and maintains alignment.
This bracket is made from galvanized steel and features pre-drilled mounting holes for easy installation on the chassis rail.
The Magneticvabe is a 3-port solenoid valve with a P99 connector, used to control air or fluid flow in pneumatic circuits. It is rated for continuous duty.
This valve features a fast response time and low power consumption. It is commonly used for suspension leveling or clutch actuation.
The Relay(20A) is a normally-open electromechanical relay rated for 20 amperes. It is used to switch high-current loads like fans, lights, or auxiliary circuits.
This relay features a sealed housing to protect against dust and moisture. Its coil is designed for 24V DC operation typical of heavy trucks.
The 100A fusion device is a high-capacity fuse that protects the main electrical distribution circuit from short circuits. It is a bolt-down type with a transparent window.
This device is designed to interrupt current flow instantly when an overload occurs, preventing damage to wiring and downstream components.
The Horn is a disc-type electric horn that produces a loud, penetrating sound for safety warnings. It is designed for 24V systems and meets ECE noise regulations.
This horn is corrosion-resistant and weatherproof, ensuring reliable operation in all driving conditions. It is mounted using the provided cross screws.
The Cross screw is a pan-head Phillips drive fastener used for securing covers, brackets, and light components. It is available in various lengths.
These screws are made of carbon steel with a zinc plating for corrosion resistance. They are used with flat and spring washers for secure clamping.
The Spring washer is a split-ring locking washer that prevents bolted joints from loosening due to vibration. It provides a constant spring force under the bolt head.
These washers are used in sizes M4, M6, and M8 across the chassis electric assembly. They are essential for maintaining clamp load in high-vibration areas.
The Hexbolt is a standard metric hexagon head bolt used for heavy-duty attachments. It is available in grades 8.8 and 10.9 for different strength requirements.
These bolts are often supplied as a combination set with spring and flat washers. They are used for mounting the stand, valve, and sensor brackets.
This pre-assembled set includes a spring washer and a flat washer, ready to be used with a hexbolt. It simplifies installation and ensures correct pairing.
The flat washer distributes the load, while the spring washer provides locking action. This combination is used for critical bolted joints in the chassis.
The I shape Hexagonal nut is a standard type 1 hex nut, used with hexbolts to create threaded joints. It is made from steel with a corrosion-resistant coating.
These nuts are available in M8 and M6 sizes, and they are used throughout the chassis electric system for securing sensors, brackets, and relays.
This switch monitors air pressure in the brake system and illuminates a warning lamp when pressure drops below a safe threshold. It is a normally-open pressure switch.
The switch is threaded to fit standard air ports and features an electrical connector for easy wiring. It is a critical safety component.
The Crosscrew is a small pan-head screw with a Phillips drive, used for light-duty fastening of covers and small components. It is typically M4 size.
These screws are supplied with spring and flat washers to ensure a vibration-resistant assembly. They are used for the horn and signal switch mountings.
The Flat washer is a plain annular disc used under bolt heads and nuts to distribute clamping load and protect the surface from damage. It is made from low-carbon steel.
These washers are used in combination with spring washers for heavy-duty applications. They are available in M4, M6, and M8 sizes.
Chassis Electric – Complete sensor, valve, relay, fuse, horn and hardware set for HOWO A7 8X4
| Part NO. | Description |
|---|---|
| WG9727710002 | Electronic barometric sensor |
| WG9725710004 | Stand |
| WG9719710004 | Magneticvabe |
| WG9725584002 | Relay(20A) |
| WG9725580006 | 100A fusion device |
| WG9718710002 | Horn |
| Q2140620F31 | Cross |
| Q40306 | Spring washer |
| Q1460825 | Hexbolt,Springwasher&Flatwasher |
| Q340B08 | I shape Hexagonal nut |
| WG9100710004 | Air pressure signal lamp switch |
| Q150B08190 | Hexbolt |
| Q40308 | Spring washer |
| Q340808 | I shape Hexagonal nut |
| Q2140410 | Crosscrew |
| Q40304 | Spring washer |
| Q40104 | Flat washer |
| Q15080620 | Hexbolt |
| Q40306 | Spring washer |
| Q40106 | Flat washer |
| 340806 | I shape Hexagonal nut |
Our Chassis Electric components are manufactured to original equipment standards, ensuring perfect compatibility with the HOWO A7 8X4. The sensor and valve deliver precise signals for optimal engine and brake performance.
All fasteners – hexbolts, cross screws, washers, and nuts – are zinc-plated and passivated for long-term corrosion resistance, even in salt-spray environments. This reduces maintenance frequency.
Our relay and fusion device are rated for continuous heavy-duty cycling, with proven reliability in off-road and on-highway applications. The horn provides clear audible warning for safety.
We offer a complete kit with all necessary hardware – no need to source separate washers or nuts. Choose our Chassis Electric solution for a hassle-free replacement that keeps your truck running efficiently.
The Chassis Electric system in the HOWO A7 8X4 is a combination of sensors, actuators, and protective devices that monitor and control various vehicle functions. The electronic barometric sensor provides altitude compensation for the engine, while the magneticvabe controls pneumatic circuits.
The relay and fusion device protect the electrical network from overloads, ensuring that critical systems like lights and horns remain operational. The air pressure signal lamp switch alerts the driver to low brake pressure, a vital safety feature.
All these components are mounted on sturdy stands and brackets using high-quality fasteners. The use of spring washers and flat washers in combination ensures that bolted joints stay tight even under severe vibration.
Regular inspection of these parts is recommended. Look for signs of corrosion on the sensor connector, wear on the horn diaphragm, and secure mounting of the relay and fuse.
When replacing components, always disconnect the battery first. Mount the stand securely to the chassis rail using the hexbolts and washers, tightening to 25–30 N·m for M8 bolts.
Install the electronic barometric sensor onto the stand with the provided cross screws and spring washers, torque to 5–7 N·m. Ensure the O-ring is seated properly to avoid leaks.
The magneticvabe should be mounted with the P99 connector facing the wiring harness. Use thread sealant on the air ports and torque to 10–12 N·m.
For the relay and fusion device, simply plug them into their respective holders. Ensure the 100A fuse is fully seated and the cover is closed. The horn is mounted with two cross screws and spring washers – test the sound after installation.
Finally, install the air pressure signal lamp switch into the brake circuit port, using a suitable thread sealant. Torque to 15–20 N·m and connect the electrical wires. Test the switch by bleeding the system.
These Chassis Electric parts are specifically designed for the HOWO A7 8X4, but many of the fasteners and standard components (spring washers, hex nuts, cross screws) are common across the HOWO range.
The sensor and valve are also used in other heavy trucks with similar 24V electrical systems. However, always verify the part numbers to ensure correct pinouts and pressure ratings.
The 100A fusion device is a standard bolt-down fuse that can be replaced with equivalent products from other suppliers, provided the rating and dimensions match.
For the horn, any 24V disc horn with similar mounting holes can be used, but genuine HOWO parts guarantee the correct sound pressure level.
Investing in genuine Chassis Electric parts ensures that your HOWO A7 8X4 maintains its original performance and safety standards. The sensor accuracy directly impacts fuel economy and emissions.
The relay and fusion device protect expensive electronic modules from damage, saving thousands in repair costs. The horn and signal switch are essential for road safety and regulatory compliance.
By using the correct fasteners and washers, you avoid thread stripping and loosening failures, which can cause downtime. Our parts are tested to withstand extreme temperatures and vibration.
We back every component with a quality guarantee. For fleet operators, we offer bulk packaging and just-in-time delivery to keep your inventory lean and your trucks operational.
Regular replacement of the air pressure signal lamp switch and sensor at recommended intervals prevents unexpected failures. Keep a spare relay and fuse in your emergency kit.
Our technical support team is available to assist with any installation questions, ensuring you get the maximum value from your Chassis Electric purchase.
Order your Chassis Electric components today and experience the peace of mind that comes with genuine HOWO quality. Your truck – and your drivers – will thank you.
With over 20 years of supplying heavy-duty truck parts, we are your trusted partner for all HOWO A7 8X4 needs. Contact us for technical datasheets and installation videos.
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