I received this unit from a friend who has a Dodge magnum with two batteries, on in the front and one in the rear of the car. He told me that a radio shop somehow wired it wrong and possibly blew the unit. I opened the unit, can't see anythyng burnt, tested & found 12v and 5v at misc points on circuit board, I would like to try and repair this unit myself because a replacement board costs $300 plus I don't have any schematics can someone please give me some tips I do have some electronics background.
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