Welcome to USA Harness


USA Harness is the leader in providing trailer harnesses and electronic control systems for transportation industries worldwide.

We design and manufacture custom systems to your specifications, while providing industry leading service and support. All of our products are made to order for your application. We specialize in providing wiring solutions for the light-duty to heavy-duty commercial vehicle industries as well as the secure transport industry.

USA Harness is the home of the patented USA-PLUS™ sealed modular wiring harness system. This system incorporates advanced sealing features with a secondary mechanical pin-lock. The USA-PLUS system is the preferred harness for U.S. Military trailer applications. 

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USA Harness is located in Winnsboro TX, two hours East of Dallas. We began operation in 1991 & have since expanded to a second facility. Both facilities are capable of full scale production. All products are subjected to rigorous quality control procedures.

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USA Harness provides the finest electrical wiring harnesses to the heavy duty commercial vehicle industry. From tagalong trailers to heavy duty off-road and military applications, our harnessing components meet and exceed industry standards.

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We'll custom design and manufacture to your requirements, and deliver your product in an efficient, timely manner. We welcome the opportunity to provide a custom solution for your trailer electrical harness or electronic control system needs.