Remember that on many late-model vehicles, you will need a "radio code" in order to reactivate the radio. Detach the speaker wire from your car stereo, making note which side goes to the left door and which side to the right. Do NOT attach it to the battery post itself. Make all connections securely, especially power connections. Once everything on your new system is working to your satisfaction, bolt the radio back in place fully and put all loose cover panels back on. Cut holes for rear dashboard mounted speakers, or use hardware supplied for ceiling or floor mounted speakers, and secure the assembly.
Car Audio System Wiring Basics
There are pro's and con's to each choice. It may already be integrated into your power cable, but if it isn't then you'll need to install it yourself. Cut the insulation off the end of all the wires and leave enough space to attach connector plugs. If you're short on wiring, either order more or locate the amplifier to suit the wiring that you have. Step 2 Run the two pairs of door speaker wires to the back of the amp and fasten to the right and left channel front outputs of the amp. If your left and right balance is reversed, switch the RCA-type audio output plugs, either on the back of the amp or on the back of your car stereo, whichever is easier to access. Some systems will only require you to use bare wires as a connection.