Most modern vehicles contain dozens of wire harnesses with thousands of wires and hundreds of connectors. That’s why, if you’re in the US, it’s best to choose a leading automotive wire harness manufacturer for reliable results.
When evaluating automotive wiring harness manufacturers, key factors include production capacity, certification standards, turnaround times, and the ability to handle both prototyping and full-scale production.
Cloom Tech is an experienced OEM wire harness manufacturer producing custom automotive wire harnesses built to your exact specifications. We use components from trusted suppliers and deliver fast turnaround times whether you’re validating prototypes or ramping into full production. Get a quote today!
Best Overall Automotive Wire Harness Manufacturer USA
1. Cloom Tech
Cloom Tech has over 25 years of experience in automotive wire harness manufacturing. Their 5,000 m² facility uses automated production lines, allowing them to deliver prototypes in 2 to 3 weeks and complete large orders in 4 to 5 weeks.
Its manufacturing is centered on custom automotive wire harnesses designed for complete vehicle platforms. They power everything from engines and lights to dashboards, safety systems, and high-voltage connections in hybrid and electric cars.
Cloom Tech as an automotive wire harness supplier uses automated processes for accuracy in every step. All harnesses are fully tested and produced to international standards, including ISO, IATF, IPC/WHMA, RoHS and REACH.
As one of the few automotive cable assembly suppliers with iatf/iso certification based in the USA, Cloom Tech provides the quality assurance and traceability that OEMs and Tier 1 suppliers require for critical vehicle electrical systems.
Cloom Tech sources materials from trusted suppliers like Molex, TE Connectivity and Yazaki to keep quality consistent. Combined with automation and certified processes, this positions them among the top automotive wire harness manufacturers USA.
| Pros | Cons |
|---|---|
| ✅ Processes include precision wire cutting, stripping, crimping, soldering, and wire marking with 100% continuity testing. | ❌ Buyers seeking off-the-shelf standard products would need alternative suppliers. |
| ✅ Global component sourcing through Molex, TE Connectivity and Yazaki ensures consistent quality. | |
| ✅ Wide product scope, including engine, transmission, lighting, dashboard, braking, battery and high voltage wire harnesses. |
Key Specs
| Years of Experience: | 25+ years of experience. |
|---|---|
| Factory Specifications: | Factory footprint of 5,000 m² with automated lines capable of producing up to 10,000 pieces per hour. |
| Certifications: | Certified to ISO 9001, IATF 16949, IPC/WHMA-A-620 and compliant with RoHS and REACH standards. |
Best for Electric Vehicle Wiring Systems
2. Aptiv PLC
Aptiv operates 131 manufacturing facilities across 48 countries, with 11 technical centers focused on automotive electrical systems. It was founded as Delphi Automotive Systems in 1994 and rebranded as Aptiv in 2017, and the company now specializes in high-voltage power distribution and Smart Vehicle Architecture platforms for electric and autonomous vehicles.
In 2022, they acquired Intercable Automotive Solutions, which added specialized high-voltage interconnect capabilities for 400V and 800V electric vehicle systems to their capabilities, bumping them up the list of the best automotive wire harness manufacturers in the USA.
The company’s Signal & Power Solutions segment does a fantastic job of handling comprehensive electrical architecture design and manufacturing including connectors, wiring assemblies and harnesses. Their manufacturing operations use advanced automation and robotics for both traditional low-voltage applications and complex high-voltage distribution systems.
Aptiv maintains IATF 16949, ISO 9001 and ISO 26262 certifications across facilities, which serve major OEMs in the automotive industry, like General Motors, Ford, Volkswagen and Toyota.
| Pros | Cons |
|---|---|
| ✅ Smart Vehicle Architecture platform and high-voltage harness specialization. | ❌ Higher costs compared to regional suppliers due to Tier 1 positioning. |
| ✅ Global Tier 1 automotive supplier status with extensive OEM relationships. | |
| ✅ Advanced high-voltage power distribution capabilities. |
Key Specs
| Years of Experience: | 30+ years (since 1994 as Delphi Automotive Systems). |
|---|---|
| Factory Specifications: | 131 manufacturing facilities globally with 11 major technical centers across 48 countries, advanced automation and robotics integration throughout manufacturing operations,specialized high-voltage power distribution and interconnect manufacturing capabilities. |
| Certifications: | IATF 16949, ISO 9001, ISO 26262 functional safety compliance for automotive systems. |
Best for Complete Electrical System Integration
3. Lear Corporation
Lear is the largest US based automotive supplier with manufacturing facilities across 36 countries and 122,000 employees worldwide. Founded over 100 years ago, the company maintains dual business segments in Seating and E-Systems, with the electrical division specializing in complete electrical distribution systems for all powertrain types.
Their comprehensive automotive wire harness solutions cover the full vehicle electrical system from initial design through production and validation.
The company’s E-Systems segment handles comprehensive electrical architecture from traditional 12V systems through to high-voltage applications exceeding 800V for electric vehicles. Their manufacturing capabilities cover wire harnesses, connection systems, integrated power modules, smart junction boxes, body domain controllers, battery disconnect units and more!
Lear’s Connection Systems portfolio includes over 200 patented terminal and connector technologies with automated production facilities using robotics for precision manufacturing.
They’ve also created an innovative Solid Aluminum Harness technology, which is a huge advancement for automotive wire harness manufacturers USA, combining copper and aluminum materials to achieve 35% weight reduction while maintaining high automation potential for both harness and vehicle assembly operations.
| Pros | Cons |
|---|---|
| ✅ Advanced high-voltage battery systems and electrical architecture. | ❌ Higher cost structure due to advanced technology focus. |
| ✅ Complete electrical distribution system capabilities. | |
| ✅ Innovative Solid Aluminum Harness technology. |
Key Specs
| Years of Experience: | Over 100 years of heritage. |
|---|---|
| Factory Specifications: | 18 Connection Systems facilities across 9 countries, advanced automation including robotics for precision applications like pin headers for gateway modules. |
| Certifications: | IATF 16949 automotive quality management systems, ISO 9001 quality management certification, over 200 patents filed in terminal and connector technologies. |
Best for Custom Auto Harnesses with UL/CSA Certified Quality
4. Custom Wire Industries
Custom Wire Industries is headquartered in Muskego, Wisconsin, and has served precision wiring and electromechanical industries since 1968 (over 55 years of experience). The company offers fully UL and CSA-certified manufacturing of custom wire harnesses, cable assemblies, control panels, over-molded components and electromechanical devices.
They serve a wide range of sectors, including automotive, with a reputation for fast turnaround, cost efficiency and quality. Their capabilities include comprehensive automotive wire harness production that supports nearly any year, make or model, from restorations to custom builds, making them a versatile automotive wire harness manufacturer in the USA.
Their services cover wire harnesses, interfacing cables, heavy-duty assemblies and cable fabrications such as coaxial, fiber optic, ribbon, power, sensor and Ethernet types. Custom tooling, CAD‑based design and fully turnkey electromechanical assemblies round out their offerings.
| Pros | Cons |
|---|---|
| ✅ Decades of experience (since 1968) with a trusted industry reputation. | ❌ No detailed public info on factory layout, floor space or shift/sizing capacity. |
| ✅ UL and CSA certified, recognized standards in safety and quality. | |
| ✅Supports wide range of automotive needs, from classic car harnesses to heavy-duty and interface assemblies. |
Key Specs
| Years of Experience: | 55+ (est. 1968). |
|---|---|
| Factory Specifications: | CAD-driven design support, turnkey electromechanical systems, fast turnaround, cost-effective assembly solutions. |
| Certifications: | UL and CSA certified. |
Best for Tier 1 Supplier Relationships
5. Sumitomo Wiring Systems Ltd
Sumitomo Electric Wiring Systems operates as a subsidiary of the 128-year-old Sumitomo Electric Industries, holding the second-largest global market share in automotive wiring harnesses. With almost 4 decades of US operations, SEWS maintains manufacturing facilities across Kentucky (Bowling Green, Edmonton, Scottsville, Lexington) and Mississippi (Canton), plus sales operations in Michigan (Farmington Hills).
The company specializes in comprehensive automotive electrical distribution systems including standard wire harnesses, high-voltage EV/HEV systems, aluminum harnesses and integrated electronic components.
SEWS also pioneered the world’s first high-strength aluminum alloy wires for engine harnesses, which deliver approximately 50% weight reduction compared to copper alternatives while offering twice the strength of standard aluminum and maintaining superior bending properties.
Their EV/HEV product portfolio encompasses under floor pipe harnesses, charger connectors, battery wire modules, power supply boxes, high-voltage connectors and charging-discharging controllers. The company also manufactures electronic control units, gateways, junction blocks, relay boxes and integrated EPB harnesses with wheel speed sensors.
SEWS maintains comprehensive automotive certifications including IATF 16949:2016, ISO 14001:2015 and ISO 9001:2015. Their “local for local” supply model serves major OEMs including Toyota Motor Corporation (aluminum harness supplier since 2010) and Honda, while mainly focusing on Tier 1 supplier relationships in the North American market.
| Pros | Cons |
|---|---|
| ✅ Part of 128-year-old Sumitomo conglomerate with second-largest global wire harness market share. | ❌ Primary US orientation toward Tier 1 suppliers rather than direct OEM relationships. |
| ✅ Pioneered high-strength aluminum wire harnesses delivering 50% weight reduction over copper alternatives. | |
| ✅ Full product portfolio for electrified vehicles including high-voltage systems and charging infrastructure. |
Key Specs
| Years of Experience: | 37 years in Kentucky (since 1988). |
|---|---|
| Factory Specifications: | Manufacturing facilities in Edmonton, Scottsville, Lexington, KY and Canton, MS. |
| Certifications: | IATF 16949:2016 (Automotive Quality Management), ISO 14001:2015 (Environmental Management), ISO 9001:2015 (Quality Management). |
Best for Comprehensive Multi-Platform Solutions
6. Motherson
Motherson is one of the world’s largest automotive component manufacturers. Founded in 1975, the India based company operates over 400 facilities across 44 countries with 190,000+ employees, maintaining a strategic partnership with Sumitomo Wiring Systems since 1986.
Their US operations include facilities in Michigan, California and Texas, enhanced by the 2017 acquisition of PKC Group for $619 million. PKC brought 45 facilities in 12 countries specializing in commercial vehicle wiring harnesses, positioning Motherson as a global truck wiring harness manufacturer serving transportation and material handling segments. This includes MWSI operations with 2 US facilities manufacturing harnesses and instrument panels for transportation and material handling segments.
The Motherson Wiring Harness division is one of the most vertically integrated operations in the industry, providing complete electrical distribution systems from design through manufacturing. Their automotive wiring harness manufacturing capabilities span from traditional 12V systems to high-voltage applications exceeding 800V for electric vehicles. Capabilities encompass standard automotive harnesses, high-voltage EV/HEV systems and specialized applications for commercial vehicles, construction equipment and off road vehicles. The division manufactures critical components in-house including wires, connectors, terminals, junction boxes and relay boxes.
The company maintains IATF 16949:2016, ISO 9001 and ISO 14001 certifications. Manufacturing capabilities include digital assembly boards, color detection systems and component presence sensors targeting zero defects.
If you need proof of their quality, they work with major clients like Mercedes Benz, Audi, Volkswagen, BMW, Porsche, GM, Ford, Stellantis, Daimler Trucks, Paccar and John Deere.
| Pros | Cons |
|---|---|
| ✅ 400+ facilities across 44 countries providing supply chain resilience. | ❌ 12 business divisions may create operational complexity. |
| ✅In house manufacturing of all critical wiring components enables superior cost control and quality management. | |
| ✅ Established relationships with Mercedes, BMW, Audi, Volkswagen, Ford and GM providing revenue stability. |
Key Specs
| Years of Experience: | 49 years (founded 1975). |
|---|---|
| Factory Specifications: | 400+ facilities across 44 countries, facilities in Michigan, California, and Texas (via PKC Group). |
| Certifications: | IATF 16949:2016 (Automotive Quality Management), ISO 9001 (Quality Management), ISO 14001 (Environmental Management). |
Best for Custom Low-to-Medium Volume Specialized Applications
7. Electro-Prep, Inc.
Electro-Prep, Inc. is a specialized contract manufacturer established in 1977. They operate from a 10,000-square-foot facility in Wareham, Massachusetts. Over their 47 years of experience, the company has built a reputation as a reliable supplier of custom wire harnesses, cable assemblies and electromechanical assemblies, serving a huge range of industries, including automotive.
The company’s core capabilities center on benchtop assembly operations utilizing state-of-the-art equipment and experienced personnel to deliver custom wire harness solutions. Their automotive applications include dashboard wiring, under-hood harnesses, door wiring systems and specialized vehicle electronics. Electro-Prep specializes in complex harness designs with reduced lead time and customer installation time.
The company maintains comprehensive inventory management enabling quick turnaround times for reliable on-time delivery while optimizing cost effectiveness through material and component selection expertise.
Electro-Prep maintains ISO 9001:2015 certification assessed by NQA USA, along with UL listing and CSA registration. The company adheres to IPC-620 workmanship standards and J-STD soldering specifications to ensure high quality output.
Their single-shift operation provides a high level of scalability with extra floor space available for expansion. The company serves customers across Massachusetts, New England, the broader USA, and Canada, positioning them as a regional specialist with national reach for specialized custom automotive manufacturing requirements.
| Pros | Cons |
|---|---|
| ✅ 47+ years of experience with complex, application-specific harness solutions. | ❌ Single-shift 10,000 sq ft operation may not suit high-volume automotive OEM requirements. |
| ✅ Complete turnkey manufacturing from design through testing with extensive inventory management. | |
| ✅ Cross-sector expertise from aerospace to medical applications enhances automotive problem-solving capabilities. |
Key Specs
| Years of Experience: | 47+ years (est. 1977). |
|---|---|
| Factory Specifications: | Single facility: 10,000 sq ft in Wareham, Massachusetts with single-shift operation with expansion capacity available, plus comprehensive inventory management system. |
| Certifications: | ISO 9001:2015 (Quality Management System), UL Listed, CSA Registered, IPC-620 Workmanship Standards, J-STD soldering specifications. |
Best Green Manufacturer for Automotive Harness Solutions
8. Omega Leads, Inc.
Founded in 1961 and based in Santa Monica, California, Omega Leads has more than 55 years of experience in custom wire harness and cable assembly production. The company shifted into interconnect manufacturing in 1974 and has since built a reputation as a US based, eco-conscious supplier serving the automotive sector.
Their proximity to Los Angeles supports strong logistics while its commitment to sustainable practices has become a defining part of its value to OEMs and Tier 1 partners.
Omega Leads’ automotive harness operations cover passenger vehicles, EVs, hybrids, trucks, RVs, off road machinery and heavy equipment. The production process uses robotic and computer-controlled assembly systems that reduce waste and improve efficiency.
The company enforces RoHS compliance, recycles materials throughout production, and promotes green manufacturing without sacrificing precision or throughput. Combined with IPC/WHMA-A-620, SAE, UL, and CSA certified quality, Omega Leads offers procurement managers a rare combination of environmental responsibility and high reliability automotive harness output.
| Pros | Cons |
|---|---|
| ✅ Green manufacturing and eco-conscious processes. | ❌ No mention of IATF 16949 automotive quality certification. |
| ✅ Broad automotive coverage, from standard vehicles to EV, heavy duty and off road segments. | |
| ✅ High-quality production: IPC/WHMA‑A‑620, SAE standards, ISO compliance, UL & CSA certifications plus RoHS and green practices. |
Key Specs
| Years of Experience: | 55+ years (founded 1961, cable assembly focus since 1974). |
|---|---|
| Factory Specifications: | 7,200-square-foot facility with fully integrated cable assembly and wire harness production with state-of-the-art robotic and computer-controlled systems. |
| Certifications: | IPC/WHMA‑A‑620, SAE standard manufacturing; ISO compliant; UL & CSA certified; RoHS compliant; “Made in USA.” |
Best for Heavy-Gauge Wire Harness Solutions
9. Precision Cable Assemblies (PCA)
Precision Cable Assemblies, established in 1980, is headquartered in Brookfield, Wisconsin, and has a global footprint with facilities in Wisconsin, Mexico, and China. It’s one of the top automotive wire harness manufacturers in the USA thanks to manufacturing sites in Brookfield and Waukesha, with engineering and prototyping done at its Wisconsin headquarters.
PCA’s reach and technical know-how make them a reliable choice for OEMs seeking stable, internationally coordinated automotive power solutions. The company specializes in heavy gauge power harnesses, battery cables and custom over-molded cable assemblies.
It handles complex harnesses with high circuit counts and rugged applications, from semi-trailers to RVs and utility vehicles. The company employs lean manufacturing techniques and vertical integration (injection molding, over-molding, boot and terminal production) to deliver quality wire harnesses at scale.
| Pros | Cons |
|---|---|
| ✅ Over 40 years of experience with global production capability and integrated ERP systems across US, Mexico and China. | ❌ US facilities lack explicit IATF 16949 certification. |
| ✅ Certified to ISO 9001:2015 (USA, Mexico, and China) and IATF 16949:2016 (China facility) for automotive grade manufacturing. | |
| ✅ In house vertical integration including prototyping, injection molding and over-molding offers streamlined development and flexible volume response. |
Key Specs
| Years of Experience: | Founded 1980, over 40 years in business. |
|---|---|
| Factory Specifications: | Original manufacturing site spans approximately 53,000 sq ft, housing wire harness, battery cable, and ground-strap assembly lines, as well as engineering and prototyping functions. |
| Certifications: | ISO 9001:2015 (USA, Mexico, China); IATF 16949:2016 at China site. |
Best for Flexible, High‑Quality Cable Assembly Solutions
10. PGF Technology Group, Inc
Founded in 1970 and headquartered in Rochester Hills, Michigan, PGF Technology Group brings over 50 years of USA based manufacturing experience across wire harnesses, cable assemblies, PCBAs and full box builds.
With around 50 employees, the company has produced more than 10 million assemblies for happy customers worldwide. Its automotive wire harness services span engine, chassis, transmission, HVAC, sensor, lighting and infotainment systems, offering prototype-to-production flexibility from a single domestic facility.
PGF’s automotive wire harness production includes crimping, soldering, connectorization, sleeving, labeling and full electromechanical integration. The company holds ISO 9001:2015 and ISO 13485:2016 certifications, complies with REACH and RoHS regulations, and follows IPC Class 2 and 3 standards.
While IATF 16949 is not listed, PGF is ITAR registered and maintains tight quality control through a lean, semi automated process tailored to high-mix production. Its biggest advantage as an automotive wire harness manufacturer USA lies in providing PCB, cable and harness manufacturing under one roof, ideal for OEMs and Tier 1s seeking secure, consolidated US sourcing with a custom engineering focus.
| Pros | Cons |
|---|---|
| ✅US based integrated manufacturing of wire harnesses, cable assemblies and PCBAs. | ❌ No IATF 16949 certification listed. |
| ✅ 50+ years of experience with full electromechanical assembly services. | |
| ✅ ISO 9001, ISO 13485, IPC Class 2/3, REACH/RoHS compliant, ITAR registered. |
Key Specs
Years of Experience: | 50+ years (est. 1970). |
|---|---|
| Factory Specifications: | Single facility in Rochester Hills, Michigan with ~50 staff operating across integrated wire harness, cable assembly, and PCB production zones. Includes ESD-safe, climate-controlled electronics room and flexible manual/automated assembly stations. |
| Certifications: | ISO 9001:2015, ISO 13485:2016, IPC Class 2/3, ITAR, REACH, RoHS. |
Back to Top: Top 10 Automotive Wire Harness Manufacturers in the USA
