Due to its large size, several organs of the blue whale are the largest in the animal kingdom. A blue whale's tongue weighs around 2.7 tonnes (3.0 short tons) and, when fully expanded, its mouth is large enough to hold up to 90 tonnes (99 short tons) of food and water.
Symptoms of a Bad Alternator, alternator problems. Symptoms of a bad alternator include hard or slow cranking when you try to start your vehicle, lights that seem too dim, and of course the red BATT, ALT, or GEN light glowing on the dash. (A friend of mine once remarked that she'd never seen an alternator warning light on a car, just a Battery light.
If the battery is bad, then you should replace it....because the battery is bad. Not because you replaced the alternator. If your battery is good, and you want to play it safe, charge the battery before running it with the good alternator. Or just let the alternator charge the battery. I agree with Unclebob, but it depends on the alternator.