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A lot of car's have 30amp fuse back when you had a cigerette lighter in that 12V power port. That said they are not wired for 30amps continuous service in spite of the fuse rating. The wire size was the weak link that said the cigarette lighter was only in use for seconds but your radio will be in use for a while under full load and rag chewing. So make sure your power port can handle the radio's load. Back when they had 2X2166's or 1969's it was a not an issue but I have no clue what they are like today. When you look at some of the power radio's can put out with various configurations today just always double check!