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I have a 2005 Trailblazer ext 4x4. My blower motor resistor went out and I went to replace, but found that the main wire harness with 7 wires 2 of them the black and red were burned and melted the harness a little. What should I look for next, were should I look. I think It might be a loose ground or bad wire some were else that caused the problem. I don't really want to take it to a dealer. I have always worked on my own cars, but electrical is tricky!