2014 Volkswagen Jetta T-One Vehicle Wiring Harness with 4 2014 Volkswagen Jetta - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Quickly and easily install a 4-way trailer connector on your Volkswagen Jetta with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring 4.9/5(47)Category: Custom Fit Vehicle Wiring 2014 Volkswagen Jetta OE Wiring Harnesses & Stereo Volkswagen Jetta 2014, Factory Replacement Wiring Harness by Metra®, with OEM Radio Plug. For factory stereo. This high-quality Metra wiring harness is just what you need to replace your defective or aged factory wiring harness.