Hi battery went flat on car so replaced with a new battery - car started first time. Left overnight and it was flat as a pancake in the morning.

Jump started the car and drove 5 miles to local garage. Garage has diagnosed as alternator - the 120 alternator which was on the car. I assumed that as the car is the 4.2 model the alternator would be the larger 150? anyone know for certain?

Also if the alternator is knackered - is it right that I could jump start and run the car without it cutting out on way to garage? i assumed it would have cut out if the alternator was shot?

any advice greatly appreciated. Regards Fraz