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SINOTRUK HOWO Electrical Junction Box Assembly WG9716580021
Core Electrical Architecture and System Coordination
1. Upstream Control Unit Interface: It works in close coordination with the CBCU (Central Control Unit, WG9716580023). The CBCU issues logic control signals that travel through the wiring harness to the junction box, triggering the closure of corresponding relays to control the power supply (switching on/off) for high-current electrical components.
2. Downstream Protection for High-Power Equipment: It is responsible for distributing power to the powertrain ECU, ABS braking system, pneumatic solenoid valves, wiper motors, A/C blower motors, and vehicle lighting (headlights, fog lights, and taillights), ensuring that the various electrical circuits do not interfere with one another.
3. Multi-Circuit Design: The box incorporates distinct circuit groups, including "constant live" circuits (Terminal 30, powered directly by the battery) and ignition-controlled circuits (Terminal 15, powered via ACC or the ignition switch). This configuration allows for the proper disconnection of non-essential electrical components after the vehicle is turned off, thereby preventing battery drain.
Common Failure Symptoms and Root Causes (Electrical Junction Box)
| Failure Symptom | Potential Root Causes | Consequences & Impact |
|---|---|---|
| Localized slot scorching / Melting | Prolonged overloading from high-power aftermarket modifications; poor contact at fuse pins generating high localized heat. | Causes complete power loss to specific electrical components (e.g., headlights, AC, wipers); severe cases may lead to wire harness smoking. |
| Chaotic vehicle electrical logic | Water ingress or moisture inside the junction box; internal circuit board desoldering caused by long-distance, severe vibrations. | Leads to mysterious fault codes, vehicle starting failure, abnormal and frequent relay clicking, or electrical components self-activating. |
| Plug oxidation / Poor contact | Moisture, humidity, and dust invading the rear main connectors during vehicle wading or under harsh working environments (e.g., mining dump trucks). | Triggers multiple dashboard alarms; the fuse shows voltage when measured with a multimeter, but the terminal equipment receives no power. |
DETAILS
| DESCRIPTION | Electrical Junction Box Assembly | PART NUMBER | WG9716580021 |
| WEIGHT | 2 kg | VOLUME | 395 mm × 210 mm × 80 mm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE |
|
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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