it really depends on the unit you have to install, and the connector that comes with it, but generally you will find that there are a bunch of wires at the back, which plug into a box, which then in turn plugs into your head unit. generally there are power lines (from the battery) and lines that carry the signal from the unit to your amplifier and speakers, sometimes there may be an auxiliary line that you can plug in different things, like ipod connectors. there may also be lines to connnect a remote control device (like the kind on your stearing wheel)
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