How To Test Car Stereo Wires. Black to car frame 95 of the time. On average car stereo installation without the car stereo is going to range anywhere from 0 if you purchase directly from a company during a promotion to as much as 300 for an advanced receiver that may require more wiring than usual.
How to wire high level input on amplifier. To wire a car stereo start by disconnecting your car battery to avoid electrocuting yourself. Connect the remaining wires.
Connect the New Stereo.
Ground the stereo. Useful for craigslist buyers or if you find an old stereo you want to test out before you go through all the trouble. Using only positive wire. When you connect the positive and negative wire to the correct polarity your cars speakers will work flawlessly.
