LaCrosse went crazy

AdielAdiel FLMember Posts: 1
edited December 2018 in Buick
My 2006 la coss CX went crazy . Head lamps, horn, wipers and water shield washer work like crazy until battery dies .
It happened several time , both horns are burnt .
changed battery , changed both computers (body and engine ) did not help
now it even worse if I connect a battery to the terminals all these things happen , but car wont start . no reading at the body computer port . any one can help ? Thanks Mates
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