![]() Make sure you have solid metal-to-metal contact between the loop on the ground cable, the mounting bolt and the grounding point. Use thick, audio-system-quality ground wire, and connect it to a heavy, unpainted metal chassis component - preferably the frame. Once you have it on, you'll need to attach the antenna's ground wire to a solid ground. You want the antenna as far up as possible for the greatest possible range. This is why most new cars have the antenna on the fender, near the trunk. Automobile ignition systems are notorious for throwing off just this kind of interference, especially those with long, unshielded spark plug wires. ![]() This signal will come through the radio as anything from a background hiss or static, to harsh popping or buzzing. The many electrical devices under your hood will throw off interference in the form of electrical inductance fields, which will hit your antenna and induce an electrical signal in it. These wires are usually short and won’t be reconnected until you are about to install the new stereo.Ideally, your antenna should be as far away from the engine compartment as possible. The antenna wire is much thicker with a metal head and can be connected separately before you install the stereo.Use the diagrams to properly match each with its appropriate wire from the car. The rest of the harness wires are for the speakers.The 12 volt constant power wire is usually yellow or blue, though it may be a number of colors coming from the car.If there is no ground wire, you can secure the ground cable to bare metal in the body of the car to serve as a ground. The ground wire for the stereo will be black, as will its corresponding wire from the car.The power wire coming from the stereo is usually red, and likely will connect to a red wire from the car.Most car stereos will require the following connections: X Research source Use the repair manual for your car or locate a wiring diagram for your car online to aid in your efforts to identify each wire. Without an adaptor, you will need to cut the wires on the back of the car’s harness clip, but do so one at a time as you connect them to their corresponding wire on the stereo to prevent confusion. If you are not using a wiring harness clip adaptor, you will need to identify the wires coming out of the stereo, as well as those coming out of the car. Disconnecting the battery will prevent you from doing damage to the electrical system as well as protect you from shocks.Nothing electronic should work with the battery disconnected. To be sure the battery is disconnected, check to see if the lights come on in the cabin of the car. ![]()
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