Haywire & Co., llc Custom Automotive Wiring Haywire has been manufacturing high quality automotive wiring harness systems to the automotive aftermarket for over 22 years now. We only use AMERICAN made wire and our wiring harnesses are assembled in our Ohio facility. As a customer, you can be assured of buying quality when purchasing any Haywire product. Thank you for visiting wwwHarnesses · Automotive Connectors · Automotive Switches · Products · New Items Related searches for custom car wiring harness who makes custom wiring harnesscustom made automotive wiring harnesscustom wiring harness kitscustom auto wiring kitcustom made engine wiring harnesscustom auto wire harnesscustom automotive wiring harnesscustom automotive wiring