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Question:

i have a new alternater and battery but my battery light comes on when i reach a certain speed?

i have a new alternater and battery but my battery light comes on when i reach a certain speed?

Answer:

what about the belt? maybe it,s slipping and needs tightening.
Stop by an auto parts store and have them test the battery and charging system. You could have a loose or corroded cable or connection, or the battery or alternator is bad. Even new parts can be faulty.

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