Metra 70-1783 Radio Wiring Harness for Smart Car

nearly three years ago we did a radial installation or how to wire a radial properly what we're going to do in this video is we're going to take you through another radial wiring and we're going to show you when to use a harness and when to use an interface what wire colors do and how to make your connections both in color and the way we do it here [Music] so the first step in wiring any radio is obviously to figure out what car you have what I mean by that is you need to make a determination as to do you need a harness or you need an interface there's a big difference between the two an interface is typically used in more newer vehicles and generally those that have a factory amplifier the reason for that is many of today's newer vehicles have data bus systems so in the old days you would turn the key one wire would go to 12 volts and turn on the radio in most newer vehicles that's act