2000 Chevrolet Silverado • 167,170 miles

I have a 2000 Chevy Silerado 1500 LT, 167,170 miles, 3 weeks ago my original alternator went out, since then I have replaced the alternator 3 times with 105 amps and it burned them all up, then I put a 145 amp in and it burned it up too. What is causing this Where do I look first?
July 16, 2012.

I just want to say thanks again to the guys at 2carpros for helping me and teaching me new information and troubleshooting techniques for working on my truck. I take a lot of pride in my truck and take the best care of it. My round trip to work everyday is 120 miles, I've put 70,000 miles on that truck int he last three years. A lot of oil and filter changes. It's going to have to last me a while with the price of trucks these days. You guys have my respect and I will stay in touch, hopefully not for no major engine problems though, thanks again.

Jul 19, 2012.