There are a few things you need to know before beginning the installation of an auxiliary cable in a car. First, make sure that your car has a power outlet and that the auxiliary cable will fit into it. Second, make sure that the auxiliary cable is properly terminated. Third, make sure that the auxiliary cable is of good quality and that it will not cause any damage to your car. Finally, be sure to follow the instructions provided by your car’s owner’s manual for installing the auxiliary cable.