hi guys posting on behalf of a friend with troubles with her mk2 focus 2.0 zetec sport. Recently had an alternator replaced as the old one gave up and the garage has tested the new alternator and battery and said that they're both fine but the battery light wont go off. Since then the car has got a problem with not starting if the cd player is on for the slightest time while the car is off and the car has also whilst driving come up with the warning light "steering assist failure" and the engine management and the car didnt have any power steering but once the car was turned off and on again it was fine. Not great with electrics so hopefully someone on here can help? not sure if the alternator has blown something? not sure where else to check if both the alternator and battery are fine?