Supported by complete in-house production facilities covering precision wire cutting, terminal crimping, PCB soldering, circular connector overmolding, braided sleeve wrapping and comprehensive electrical testing, we deliver reliable interconnection solutions to global clients. We have rich experience developing various car wiring cables for vehicle diagnostic systems, sensor networks and on-board electronic modules. Our engineering team designs and manufactures diverse custom cable assembly and wiring harness for heavy-duty trucks, construction machinery and industrial control equipment. We also supply a comprehensive range of automotive wiring harness connectors including J1939 circular connectors, OBD2 interfaces and multi-pin signal connectors, fully complying with RoHS environmental standards and strict quality inspection procedures.
This J1939 Diagnostic Splitter Cable is a multi-branch signal distribution harness specially engineered for commercial vehicle J1939 diagnostic networks and Cummins engine connection systems. Different from simple Y-type power takeoff cables and single-channel sensor extension wires, this product adopts an integrated multi-interface architecture with a built-in PCB control board. The main interface uses a green J1939 9Pin female connector for vehicle diagnostic port connection, which splits into multiple independent branch interfaces including two additional J1939 9Pin female connectors, one 16Pin OBD2 connector, one 4Pin signal connector and one 3Pin power connector. This unique multi-branch design allows technicians to simultaneously connect multiple diagnostic devices, data loggers and on-board modules to a single vehicle J1939 network port, eliminating the need for frequent cable swapping and greatly improving diagnostic efficiency.
| Item |
Description |
| Product Name |
Custom J1939 9Pin to Multi Connector Splitter Wiring Harness with PCB |
| Type |
Multi Branch J1939 Diagnostic Splitter Cable / Automotive Signal Distribution Wiring Harness |
| Rated Test Voltage |
DC 300V 10MS Test Voltage, 12V DC Working Voltage |
| Pins Material |
Nickel Plated Brass Terminals, Gold Plating Optional |
| Plug Material |
PA66+GF Automotive Grade Connector Housing, J1939 9Pin Green Connectors, OBD2 16Pin, 4Pin and 3Pin Connectors |
| Working Temperature |
-40℃ ~ +105℃ Or Customized |
| Length |
Branch Length 300±30mm, Customized Length Available |
| Minimum Insulation Resistance |
≥5MΩ |
| Maximum Conduction Resistance |
≤5Ω |
| Compliance |
RoHS Compliant |
| Application Fields |
Heavy duty truck J1939 diagnostic, commercial vehicle ECU connection, multi channel signal distribution, automotive diagnostic equipment, Cummins engine connection, vehicle data acquisition, SAE J1939 network splitter |
| Specific Shipping Cost |
Please Contact Us |
The internal structure integrates a dedicated PCB board (FB10109/FB10110) with optimized circuit design, featuring BAT power input, DAT signal line and GND ground connection with switch control function. The PCB board enables controlled signal distribution and power management, allowing selective activation of connected devices through the DAT switch circuit. Key signal sections adopt twisted-pair wiring design with controlled 25mm twist pitch, effectively suppressing electromagnetic interference from vehicle engine compartments and ensuring stable J1939 network communication. The main cable sections are wrapped with black braided mesh sleeves for abrasion resistance and mechanical protection, with heat shrink tubes applied at branch split points and connector transitions for reinforced strain relief and sealing. The J1939 9Pin connectors use green automotive-grade housings with threaded locking structure for reliable vibration resistance and secure connection during vehicle operation.
Every finished harness undergoes strict 100% electrical testing before delivery, including full continuity inspection, DC 300V withstand voltage test, insulation resistance measurement and conduction resistance verification to eliminate open circuits, short circuits and pin misalignment. The PCB board undergoes functional testing with 12VDC power input and switch cycle verification to ensure consistent signal switching performance. Insulation resistance is maintained above 5MΩ while maximum conduction resistance is controlled within 5Ω, ensuring stable electrical performance across all signal channels. All raw materials fully comply with RoHS environmental requirements. The connector housings are made of high-strength PA66+GF engineering plastic with accurate pin alignment, and the cable jacket resists oil, abrasion and mild chemical corrosion typical of commercial vehicle maintenance environments. The product is bundled with cable ties and packaged in protective PE bags for convenient storage and transit.
This J1939 multi-branch splitter harness is widely applied in heavy-duty truck diagnostic systems, Cummins engine ECU connection, commercial vehicle data acquisition, fleet management device installation, multi-device simultaneous diagnostic work, vehicle performance monitoring and SAE J1939 network expansion projects. It serves as a reliable signal distribution medium for workshops and diagnostic service providers requiring multiple device access to a single vehicle network port. If you need to adjust branch connector types, pin assignment, cable length, PCB circuit function or shielding structure for different vehicle configurations, our engineering team can develop exclusive solutions using tailored automotive wiring harness connectors. We continuously optimize the signal integrity and mechanical durability of every product in our custom cable assembly and wiring harness lineup, and our comprehensive car wiring cables portfolio can support various custom interconnection projects for commercial vehicles and industrial equipment. Welcome to send technical drawings, interface specifications or sample requests for detailed evaluation and competitive quotation.
