Our Astra came to a gradual stop, the ESP and ABS lights came on and the steering went heavy and it stalled. We tried to restart it but there was a clicking sound. We called for recovery who jump started the car but as we tried to drive off steering was heavy and we could not steer the car. He checked and said it's not the alternator, it's the belt, then checked the belt and said there's not enough tension and it needs a new one.