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. See our product page for more details.