Q: Q: Battery light on

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The battery light has been blinking on and off for the last couple of months. Tonight while I was driving, all the lights came on my dash board. The brake light was on too and the hand brake wasn't even on. I could barely drive the car. I was almost home so I just drove it home and parked it on the driveway. Do I need a new alternator? How much will that be?

My car has 136000 miles.
My car has an automatic transmission.

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