Intelligent DC-DC power supplies in most cases have a number of wires for connected to any car's electrical system. This includes, PVC Insulated Cable at the bare minimum, a Power wire, ground wire, PVC Insulated Cable and a remote wire. The remote wire is wired to a 12v source that only becomes active when smooth stomach is all of the ignition. The most prevalent usage is by using the remote wire from your CD player/head unit, that way, as soon as the CD player turns on, so does the carputer.
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