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Q: alternator on 2002 Mercedes-Benz C240

alternator replace and car still want crank and brake lighs want come on
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The alternator will not cause a no crank condition unless the battery is down because of faulty charging. If the brake light switch is bad, draining the battery, can cause the no crank and no stop lights.
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Why did you replace the alternator? The engine spins over? The brake lights are not on a battery bus, should only work with the key on. The rear SAM module may be keepng the brake lights on, and it plays role with the fuel pump.
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