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Gone but never forgotten
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A much safer way than pulling the battery cable off of a running engine, is to measure the voltage across the battery terminals with the engine running, using a volt-meter. Reason being is that car batteries produce an explosive hydro-cloric gas that can be ignited from the spark jumping from the post to cable as it's removed or replaced.

That being said, if the car died when a cable was pulled, you are not putting out any voltage from your charging system. Most likely culprit is the voltage regulator, since you just replaced the alternator. Replace the voltage regulator, then see what your voltage across the battery is at idle. If it's not 14v, your new alternator needs to be tested (any auto parts store can do it).

This is assumming that your current alternator/voltage regulator are hooked up correctly and all the wiring is in working condition.
 
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