Hi again, I've got a 04 Envoy with a 5.3 and when I really hit the gas the alt stops working? Gauge falls, light comes on and after I let off in goes back to normal. It mostly does it get on freeway, getting up to 80. The belt is new and clean. I'm stumped? Is it supposed to do that, like a cut off for load reduction? A/C does that too,Right?