Amazon: car stereo wiring harness connectors Amazon's Choice for car stereo wiring harness connectors. Posi-Products Posi-Twist Wire Connectors 18-26 gauge. 4.8 out of 5 stars 115. $9 $ 9. 94. Get it as soon as Tue, Jun 18. FREE Shipping on orders over $25 shipped by Amazon. Car Stereo Radio Wiring Harness Antenna Adapter for Buick Chevy GMC Pontiac. Car Stereo Wiring Harness - scosche Our stereo wiring harness kits are the best in the industry and ensure an easy and clean car stereo installation. Our extensive car stereo wiring harness collection ensures that you will find the exact harness needed for you car.