Q: What should I do if my car brake and battery light show steady as the engine run on 2002 Infiniti I35

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it all started the day before yesterday and I replaced the alternator with another used one of the same capacity but today it started again. Pls help to advice on what next to do.

(1) Answer
Is your brake light red? if so, then maybe your brake fluid reservoir is low...I suggest that you have your brakes checked (or check them yourself). The battery light means your alternator is not charging...have your charging system diagnosed, I suspect that your alternator is starting to fail.