Whining or screeching noise after the vehicle starts.
Dim or overly bright lights.
Smell of burning rubber or wires.
Dead battery.
Battery dashboard warning light is on.
Alternator 坏了, 就无法提供正常电压了, 也无法充电了, 和电池好坏无关
How long will a battery last with a bad alternator?
How long can a car last on just the battery? If your alternator fails when you're far from home, you can typically drive up to 200 miles on battery power alone. That's assuming your battery is in good shape and fully charged. Of course, it's best to get the alternator repaired or replaced as soon as you can.