I'm trying to set up my amp and sub to the factory nav radio I can find the wiring diagram but was told by a friend to check and see how many RCA jacks it has I'm new at this and I read tht my car already has a factory amp near the drivers seat and in fact I don't need to hook up the new amp for the sub at the actual deck but at the factory amp? Can someone try and help me better understand what I need todo like I said I'm new to this, thanks!!
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