Is my Voltage regulator bad?

I had the same problem last summer. I did the old check all grounds and traced every darn wire twice. It was the voltage regulator. I had to buy 3 until I found a good one.
ACdelco blew up as soon as the car started. So NAPA had two for 14 bucks each bought both and only one worked. I lost two months last year testing and retesting everything. So if it worked for ya before but not now if it's grounded right then it's the regulator.