2002 gmc envoy radio wire harness | eBay Find great deals on eBay for 2002 gmc envoy radio wire harness. Shop with confidence. 2002 GMC Envoy OE Wiring Harnesses & Stereo Adapters GMC Envoy 2002, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug and Amplifier Bypass. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.