Died in the middle of the highway : (
 

I have a S80 Dual Turbo and was driving down the highway and my dash indicated that I have low voltage. A triangle light came on and then the car shut down. No Power, No brakes but my steering was OK. It isn't the battery and was told it is most likely the alternator. Just bought a new alternator and was told it may be a sensor of some sort, not the alternator. Can someone help??