US Automotive Secondary Wiring Harness Market Size & Share Analysis - Growth Trends and Forecast (2026 - 2035)
US Automotive Secondary Wiring Harness Market: by Type (Main Harness, Auxiliary Harness, Engine Harness, HVAC Harness, Sensor Harness, Battery Harness), Application (Passenger Vehicles, Commercial Vehicles, Electric Vehicles, Two Wheelers, Heavy Vehicles, Off Road Vehicles), Distribution Channels (OEMs, Aftermarket, Distributors, Direct Sales, Online Retail, Wholesalers), Technology (Conventional Wiring, Modular Wiring, Optical Fiber Wiring, Shielded Wiring, High Voltage Wiring, Wireless Wiring), Organization Size (Small, Medium, Large) and By US Historical & Forecast Period (2020-2035) Comprehensive Study 2025
Last Updated: 23-07-2025 | Format: PDF | Report ID:1405 | Author: Clara
The US Automotive Secondary Wiring Harness Market encompasses the design, production, and supply of electrical wiring systems that facilitate power delivery and signal transmission in vehicles apart from the primary harnesses. These secondary harnesses are essential for integrating advanced vehicle electronics, safety systems, infotainment, and power management, especially with increasing inclusion of modern features in passenger and commercial vehicles, electric vehicles, and specialized vehicles. As vehicles become more electrified and automated, the market witnesses strong demand for solutions supporting modularity, weight reduction, and improved diagnostics. The market size is projected to reach USD 5,200 Million by 2025 and grow at a CAGR of 7.8%, reaching nearly USD 11,000 Million by 2035.
Latest Market Dynamics
Key Drivers
Rapid electrification of vehicles, driving demand for complex wiring architectures. For example, Aptiv PLC is expanding its EV-specific harness systems to address high-voltage needs in the US market.
Increase in onboard electronics and safety technology in passenger and commercial vehicles. Lear Corporation’s expansion in advanced sensor and modular harness technologies highlights this trend.
Key Trends
Adoption of lightweight and modular harness designs to improve fuel efficiency and ease of installation, implemented by Sumitomo Electric Industries in recent model year launches.
Growth of optical fiber and high-voltage wiring in EVs, with Yazaki Corporation integrating fiber-optic solutions for faster in-vehicle data communication.
Key Opportunities
Rising adoption of electric and hybrid vehicles, as government incentives accelerate the need for advanced harnesses; evidenced by Leoni AG’s investments in North American EV harness production.
Expansion of aftermarket service demand for customized harness replacements, supported by Nexans growing its distribution network for aftermarket automotive solutions.
Key Challenges
Complexity in integrating multiple technologies (e.g., ADAS, infotainment) into cohesive harness assemblies, recognized by Motherson Sumi Systems as a manufacturing bottleneck requiring precise engineering.
Cost pressures from raw material price fluctuations, affecting profitability for suppliers like Draexlmaier Group operating in US markets.
Key Restraints
Rising labor costs and supply chain constraints post-pandemic, with PKC Group noting supply delays for critical wiring components.
Stringent regulatory requirements around wiring safety and emissions, compelling suppliers such as Furukawa Electric to invest more in compliance, thereby impacting profit margins.
In 2025, Main Harnesses account for the majority of the US Automotive Secondary Wiring Harness Market, capturing 34% of the total market share, followed by Engine Harnesses at 26%, and Sensor Harnesses at 20%. The growing need for advanced electronic systems, power management, and reliable engine performance in modern vehicles contributes to the dominance of these categories. Auxiliary, HVAC, and Battery Harnesses make up the remainder, collectively addressing specialized applications, particularly in electric vehicles and luxury models. This segmentation reflects the automotive sector’s focus on reliability, performance, and the integration of smart vehicle features.
Passenger Vehicles lead the applications segment in 2025, holding 42% of the US market for secondary wiring harnesses, thanks to continuous upgrades in in-cabin electronics and connectivity. Electric Vehicles follow at 24%, driven by government incentives and the rapid introduction of new EV models requiring complex harness solutions. The Commercial Vehicles segment holds 18%, while Heavy Vehicles and Off-Road Vehicles together make up 10%, and Two Wheelers account for 6%. The data highlights the automotive industry’s focus on consumer comfort and electrification, positioning secondary wiring harnesses as a backbone for advanced automotive technologies.
The US Automotive Secondary Wiring Harness Market revenue demonstrates robust growth, with revenues rising from USD 3,100 Million in 2020 to USD 5,200 Million in 2025. The upward trend continues, projected to reach approximately USD 11,000 Million by 2035. Key growth contributors include rising electric and hybrid vehicle penetration, technological advancements in sensor and communication systems, and expanding aftermarket demand for custom harnesses. The steady increase showcases the market's resiliency amidst changing regulatory environments and evolving OEM requirements.
Year-on-year growth for the US Automotive Secondary Wiring Harness Market peaks at 19% in 2025, driven by post-pandemic recovery, government electrification policies, and the launch of new vehicle models. The growth rate normalizes to around 8–10% annually through 2030, reflecting market maturation and ongoing innovation in wiring solutions. By 2035, year-on-year growth stabilizes at a steady 3% as the market reaches a sustained volume, indicating strong long-term potential.
The Midwest leads regional shares in 2025 with 36% of market revenue, stemming from its automotive manufacturing concentration and supplier base. The Southern region follows at 28%, benefitting from expanded EV production facilities and favorable state policies. The Western region, driven by technology adoption and R&D, captures 20%, while the Northeast rounds out the market with 16%. This distribution underscores the importance of established supply chains, technological hubs, and new facility investments across the US automotive landscape.
Yazaki Corporation commands the largest share at 18%, reflecting its longstanding OEM relationships and high-volume contracts. Aptiv PLC and Sumitomo Electric each hold 15% and 13% respectively, leveraging innovation in modular and EV-focused harnesses. Lear Corporation (10%) and Leoni AG (8%) follow, while other notable vendors collectively account for 36%. The market is moderately consolidated, with top players focusing on R&D, strategic partnerships, and regional facility expansions to secure their positions.
Major OEMs represent 54% of the US Automotive Secondary Wiring Harness Market buyers in 2025, signaling their role in setting specifications and large-scale sourcing. Distributors and Wholesalers account for 22% as they cater to aftermarket needs and smaller manufacturers. The aftermarket/customization segment holds 14%, addressing vehicle owners and specialty builders. Fleets and direct business customers represent 10%. This buyer mix highlights the centrality of OEMs but also the significant opportunities in the growing aftermarket and customization channels.
Study Coverage
Metrics
Details
Years
2020-2035
Base Year
2025
Market Size
Revenue (USD Million)
Regions
Midwest, South, West, Northeast
Segments
By Type (Main Harness, Auxiliary Harness, Engine Harness, HVAC Harness, Sensor Harness, Battery Harness), By Application (Passenger Vehicles, Commercial Vehicles, Electric Vehicles, Two Wheelers, Heavy Vehicles, Off Road Vehicles), Distribution Channels (OEMs, Aftermarket, Distributors, Direct Sales, Online Retail, Wholesalers), Technology (Conventional Wiring, Modular Wiring, Optical Fiber Wiring, Shielded Wiring, High Voltage Wiring, Wireless Wiring), Organization Size (Small, Medium, Large)
June 2024: Aptiv PLC announced a strategic partnership with a leading US EV maker to co-develop advanced high-voltage wiring harnesses for next-generation electric SUVs.
July 2024: Leoni AG launched a new modular wiring harness facility in Georgia, focusing on custom EV applications and rapid prototyping for US automakers.
July 2024: Sumitomo Electric Industries expanded its Detroit R&D center, investing in next-gen fiber optic automotive wiring technologies.
August 2024: Yazaki Corporation introduced lightweight recyclable harnesses for commercial fleet vehicles, promoting sustainability across US markets.
August 2024: Lear Corporation secured a major contract with a top US OEM, delivering sensor-heavy secondary harness systems for upcoming autonomous vehicles.
Frequently Asked Questions
About the Author
Clara
Senior Market Research Analyst
Clara is a Senior Market Research Analyst specializing in market research, industry analysis, and business consulting across Automotive & Transportation. Clara brings a commercially grounded perspective to sectors shaped by changing demand, innovation, and competitive dynamics, helping turn complex market trends into clear strategic insights for business decision-makers. With 10+ years of experience across research, analytics, and strategic advisory roles, Clara has helped organizations translate data into actionable growth strategies.
