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Yes the downfall of the Autek was the fact the center pin on power jack is ( - ) and the outer shell was ( + ) which was a bad mistake for those who didn't pay attention as it should be written on the back of the case. Basically was reversed  from what anyother 12 Volt  device would be wired and not paying attention or knowing resulted  in reverse polarity. I still today cannot understand why the heck they did that.