what does it mean when my battery light comes on while i'm driving? on 2007 Jeep Compass

battery light is on while driving

Asked by for the 2007 Jeep Compass
your alternator has a proble. get it checked asap before the system goes dead.

thank you.. i will get it checked out tomorrow. how much is an alternator if needed . 2007 jeep compass
alt is around 250 and 1.3 hours to replace