I have found with late model head units on old cars to hook the 12v constant straight to the battery with an inline 15amp fuse, because if you turn them up with an amp or somtimes on there own its to much for the old fuses espiecally the original 3 amp radio fuse. i have always used the cig lighter fuse for acc as it also uses a large fuse. also did you scrape the paint off when you connected the earth?
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