My wife and I bought the rendezvous back in February 12th 2015, and immediately noticed a problem with the way it started. we drove the car and then the battery light came on. we told the salesperson about it and it was stated to us if it happened again bring it in and we will take care of it. mind you we had a warranty on it when we bought it. few days after the warranty expired the problems came back, but worse. the battery light came on still the headlights would blink, the radio would come on and go off, the cooling fans would come on. I had to disconnect the batttery to get it to stop. we was sold another warranty which is no good since this was a pre existing problem. the car has been in the shop twice now. one place said the the batt was over charging, and the bcm (Body Control Module) could be going out. the second place we took it was a Certified GM dealership. the ran a diagnostic on the car and found nothing wrong. no codes batt was charging fine. they found nothing. My question is what in the hell is causing this car do act up.