Custom Automotive Wire Harness Manufacturer
LEX designs and manufactures custom automotive wiring harnesses and EV cable assemblies for vehicle electronics, control systems, and power distribution. OEM solutions tailored to your drawings, connector specifications, and production requirements.
Our Clients
Industry Applications
Automotive wire harnesses support electrical and signal connections across vehicle control systems, onboard electronics, lighting, and electric vehicle architectures. Each application requires appropriate cable routing, connector selection, environmental protection, and validation.
EV & Energy Storage Systems (NEV Solutions)
Vehicle Control & Infotainment Systems
Specialized Commercial & Passenger Vehicles
Automotive Wire Harness Selection Guide
Selecting the right automotive wire harness depends on electrical load, operating temperature, connector compatibility, environmental protection, and vehicle application. Use this guide to identify key requirements for your custom wiring harness project.
| Automotive Application | Key Selection Requirements | Technical Considerations |
|---|---|---|
| Engine & Powertrain | Heat resistance, vibration protection, and secure electrical connections. | Wire insulation, connector sealing, cable routing, and mechanical protection. |
| Dashboard & Infotainment | Compact wiring design and reliable power and signal transmission. | Connector dimensions, signal shielding, cable organization, and installation space. |
| Automotive Lighting | Stable power delivery and protection against moisture and vibration. | Current rating, connector sealing, wire gauge, and harness length. |
| EV Battery Management (BMS) | Reliable voltage and temperature sensing connections. | Signal integrity, insulation, connector compatibility, and routing. |
| Sensors & ADAS | Stable data and signal transmission with interference protection. | Shielding requirements, signal routing, connector reliability, and EMC considerations. |
| EV High-Voltage Systems | Electrical insulation, safe power connections, and environmental protection. | Voltage and current ratings, HV connector compatibility, thermal protection, and safety validation. |
Connector Options for Automotive Wire Harnesses
Connector selection depends on current rating, installation space, temperature, vibration, sealing requirements, and mating compatibility. Compare connector options for automotive control, power distribution, and vehicle electronics.
Mini-Fit Jr.™ Connectors
Supporting a high-current capacity of up to 13A per circuit with a secure TPA locking mechanism. These are the preferred choice for reliable power distribution in vibration-heavy environments, such as automotive systems, industrial machinery, and high-power medical equipment.
KK™ Series Connectors
A cost-effective wire-to-board solution with a standard pitch. Frequently utilized in auxiliary control boards for consumer electronics, household appliances, and diverse industrial control modules.
Micro-Fit 3.0™ Connectors
Featuring a compact 3.0mm pitch to solve space-constraint challenges. Their polarized, foolproof design eliminates the risk of mis-mating in high-density control systems, robotics, and telecommunications infrastructure.
MX150™ Sealed Connectors
Engineered with an IP67 rating to provide a complete seal against moisture ingress and dust contamination. Essential for marine electronics, automotive engine compartments, and outdoor industrial equipment requiring exposure to harsh fluids and weather.
FCT D-sub Connectors
Providing high-durability, interference-resistant connectivity for complex user interfaces, laboratory equipment, and aerospace communication systems.
Nano-Fit™ Connectors
Delivering robust electrical performance in an ultra-compact 2.50mm pitch. These are ideal for Internet of Things (IoT) sensors, wearable technology, and compact electronics where every millimeter of PCB space is critical.
SL™ Modular Connectors
Utilizing advanced shielding and locking technology to maintain superior signal integrity in high-speed data applications. They serve as the backbone for data centers, industrial automation networks, and smart infrastructure.
Custom Automotive Wire Harness Manufacturing Services
LEX supports custom automotive wire harness projects from engineering review and prototyping to assembly, testing, and production. Each harness is developed around customer drawings, connector specifications, and vehicle application requirements.
01
Engineering Review & DFM Support
Review wiring diagrams, connector specifications, electrical requirements, and cable routing to improve design feasibility and manufacturing efficiency.
02
Custom Prototyping & Sample Development
Develop automotive wire harness samples from customer drawings and BOMs. Verify connector fit, pin assignments, cable lengths, and assembly details before production approval.
03
Automotive Wire Harness Manufacturing
Wire cutting, stripping, terminal crimping, connector assembly, and cable protection based on approved drawings and production specifications.
04
Wire Harness Testing & Quality Inspection
Apply project-defined electrical and visual inspections, followed by production documentation, protective packaging, and shipment coordination.
Why Choose LEX?
Empowering global industry leaders with custom-engineered connectivity solutions, anchored by uncompromising quality and rigorous international standards.
Certified Quality Excellence
Our manufacturing facility is governed by a rigorous IATF 16949:2016 and ISO 13485:2016 certified quality system. We maintain strict adherence to international safety standards, including UL and CSA certifications, ensuring every interconnect component is compliant with the demanding requirements of automotive, medical, and industrial environments.
Advanced Technical Precision
We leverage high-end automation, including ultrasonic welding and automated UV glue dispensing, to guarantee superior bond strength and hermetic sealing for harsh environments. Every assembly is validated through terminal cross-section analysis and CCD electronic magnification to ensure zero-defect performance across all critical applications.
Strategic Global Support
With 5,000+ square meters of manufacturing space across our Xiamen and Zhangzhou bases, we offer the scalability to handle large-volume global contracts for industry leaders. Our dedicated sales office in Texas, USA, provides localized project management and seamless communication for our North American partners, ensuring real-time technical support.
Design-to-Cost Innovation
As a National High-Tech enterprise, our engineering team specializes in developing high-performance, cost-effective wire harness solutions tailored to your unique requirements. From rapid prototyping to mass production, we collaborate with your R&D department to provide DFM (Design for Manufacturing) optimization that maximizes your competitive edge in the global market.
Quality Management & Certifications
LEX applies structured quality management systems, controlled manufacturing processes, and inspection procedures to ensure consistent performance and reliable quality for custom wire harnesses and cable assemblies across multiple industries.
IATF 16949:2016
Automotive quality management standard supporting structured production processes and customer-specific requirements.
ISO 13485
Quality management system supporting controlled manufacturing processes, documentation control, and consistent product quality management.
Production Quality Control
What Our Customers Are Saying
From rapid prototyping to large-scale production, we’ve built lasting partnerships based on manufacturing excellence and transparent communication. Here is what our global partners across diverse industries have to say about their experience working with us.
Frequently Asked Questions
1. What types of automotive wire harnesses can LEX manufacture?
LEX provides custom automotive wire harness solutions for passenger vehicles, commercial vehicles, and electric vehicle applications. Typical applications include engine control systems, dashboard electronics, vehicle lighting, ECU connections, sensors, battery management systems (BMS), and auxiliary power distribution.
Harness configurations can be developed around customer drawings, connector specifications, electrical requirements, and installation conditions. Each project is reviewed to determine suitable wiring materials, terminal types, connector interfaces, and assembly methods.
2. How do you select the right connectors and cables for automotive applications?
Automotive connector and cable selection depends on operating voltage, current load, temperature exposure, vibration, moisture protection, and available installation space.
For example, engine compartment harnesses may require heat-resistant insulation and sealed connectors, while dashboard and infotainment assemblies often prioritize compact connectors and stable signal transmission.
LEX supports connector selection and Design for Manufacturing (DFM) reviews to help customers balance electrical performance, assembly reliability, and production cost.
3. What quality tests are important for automotive wire harnesses?
Automotive wire harness quality control typically includes electrical continuity testing, short-circuit detection, terminal crimp inspection, wire identification, and visual assembly checks.
Depending on the application, additional validation may include insulation resistance, dielectric withstand, vibration resistance, thermal cycling, and connector sealing tests.
LEX reviews testing requirements according to customer specifications and project needs. Test methods, acceptance criteria, and required inspection records should be established before production.
4. Can LEX develop custom wire harnesses for electric vehicles and battery management systems?
LEX supports custom harness development for electric vehicle electronics, battery management systems, control modules, and related electrical connections.
EV applications require careful consideration of electrical load, connector compatibility, temperature conditions, insulation, cable routing, and applicable safety requirements. High-voltage and low-voltage harnesses must be evaluated according to their different design and validation requirements.
Customers can submit wiring diagrams, connector information, and technical specifications for engineering review and production feasibility assessment.
5. What information is needed to request a custom automotive wire harness quotation?
To prepare an accurate quotation, customers should provide the wiring diagram or harness drawing, connector part numbers, wire specifications, harness length, branch layout, and estimated order quantity.
Additional information, such as operating temperature, voltage and current requirements, sealing requirements, target vehicle application, and required testing standards, helps clarify material selection and manufacturing requirements.
If a complete drawing is unavailable, customers can submit existing samples, reference photos, or preliminary specifications for initial technical evaluation.