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E: 15829336298@139.com
E: 15829336298@139.com
Room 1212-G107, Unit 2, Building 1, Block A, Shenglong Plaza, No. 80 Weiyang Road, Weiyang District, Xi'an City, Shaanxi Province
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WG9716582301
Sinotruk HOWO
| Attribute | Description |
|---|---|
| Part Name | Electrical Junction Box Assembly / Central Fuse & Relay Box / Power Distribution Module (PDM) |
| Common Names | Main Relay Box, Central Control Unit Housing, Chassis Electrical Hub |
| OE Number (Original Equipment) | WG9716582301 |
| Alternate Total Part No. | AZ9716582301 (some production batches use "AZ" prefix) |
| Manufacturer | China National Heavy Duty Truck Group (Sinotruk / CNHTC) |
| Function | Acts as the central hub for electrical power management and control logic execution in the chassis and engine system |
| System Role | Integrates fuses, relays, and PCB traces to distribute 24V power safely and manage key circuits including: • Engine ECU power supply • Starter control • Preheating system • Sensor signal protection • Lighting and auxiliary systems |
| Design Type | Modular plastic enclosure with integrated fuse/relay slots and multi-pin harness connectors |
| Mounting Location | Typically mounted on the chassis frame rail beneath or beside the cab (driver’s side), protected by cover but accessible for service |
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| Parameter | Specification |
|---|---|
| Rated Voltage | 24V DC – Standard for heavy-duty commercial vehicles |
| Operating Voltage Range | 18–32V DC (compatible with charging system fluctuations) |
| Total Weight | Approx. 8.0 – 8.5 kg |
| Dimensions (Approx.) | 35 cm × 35 cm × 33 cm (L×W×H) |
| Enclosure Material | Industrial-grade flame-retardant ABS + PC blend (UL94 V-0 rated) |
| Sealing Level | IP65 – Dust-tight and protected against water jets from any direction |
| Internal Components | Integrated array of blade-type fuses and ISO micro/miniture relays |
| Fuse Types Supported | ATO, ATC, Mini, Maxi (e.g., 10A, 15A, 20A, 30A, 40A, 70A) |
| Relay Types Supported | 24V DC relays: SPDT, DPDT configurations |
| Connection Interface | Multiple high-density plug-in terminals for main harness, sub-harnesses, and ground links |
| Thermal Resistance | Operates reliably from -40°C to +105°C ambient temperature |
| Certifications | Complies with GB/T, ECE R10 (EMC), and CE standards |
⚠️ WARNING: Work involves high-current circuits. Failure can lead to fire or ECU damage. Disconnect battery first!
Park on level ground, turn off ignition.
Disconnect both battery terminals (start with negative).
Wait 2–3 minutes to allow capacitors to discharge.
Locate the box on the frame rail (usually near left-side cab mount).
Remove protective cover and mounting bolts.
Take note of harness routing and grounding straps.
Carefully unplug all multi-pin connectors.
Label each connector if necessary.
Inspect pins for corrosion, bending, or overheating signs.
Unscrew mounting brackets.
Gently remove the entire junction box — avoid pulling wires.
Place new unit into position.
Secure with original or compatible fasteners.
Torque to ~8–10 N·m (do not overtighten plastic housing).
Plug in all harnesses firmly until they click.
Reattach grounding straps securely.
Ensure no foreign objects or moisture inside the box.
Replace rubber gasket and seal cover tightly.
Reconnect batteries.
Turn key to ON — check dashboard lights and ECU self-check.
Start engine — confirm normal operation of all systems (lights, gauges, horn, wipers).
Use diagnostic tool to scan for electrical faults.
✅ Recommended: Perform continuity test on major circuits post-installation.
