Semi Truck Stereos & Wiring - Fit My Truck - 12Volt-Travel® Finally time to replace that old stereo in your Semi-Truck? We have just what you need! Select your make, model and year for a list of wire harnesses that will fit your truck. Our stereo wire harnesses are specially made for big rigs and work with their corresponding stereo type. Semi-Truck Stereo Wiring Harnesses - 12Volt Travel When installing a new semi-truck stereo it is likely that you will need a wire harness. We do carry a full line of semi-truck stereo wiring harnesses to make your installation quick and easy.