Do I disconnect the negative or positive charge on the battery to the car to check alternator?

I think my alternator is going out. I have been checking the internet, but I get both answers. Do I disconnect the negative or positive charge on my battery to check if my alternator is going out?? I know that I need to disconnect one of those then start the car, if it doesn't start it's the alternator. Right? show more I think my alternator is going out. I have been checking the internet, but I get both answers. Do I disconnect the negative or positive charge on my battery to check if my alternator is going out?? I know that I need to disconnect one of those then start the car, if it doesn't start it's the alternator. Right?
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