[cobra427mnsi]

I'm not sure if this applies to your situation or not, but, I was having alternators go bad on a regular basis. I even switched from the Ford to the GM style to no avail. Looking closely at my setup, I noticed that the alternator was fairly close to a header tube. I put a heat shield ( a piece of sheet stainless) between the header tube and the alternator and have had no trouble now for a couple of years.