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I had this problem. The alternator was fine, it was the battery that was bad. The alternator was "pegging" out the indicator bc it was trying to charge the battery, but it wasnt taking charge. Take the battery out and have it checked.

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Q: Why is your battery light on and Battery meter pegged high on the instrument panel in your 2002 F150 pickup Alternator If so how do you change it out?
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