I just replace my battery a week ago, third one in 1 1/2 yrs always was real slow starting slow cranking. then today was out for a few hours wouldnt start . the positive wires were so hot that the post melted on the battery! not sure what the problem is. could there be a short with the starter? b/c each time I bruoght the battery back they tested it and was told it tested bad. any help????