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A larger alternator is going to have more rotating weight so it's going to take more energy to turn it.
There is no way your truck in it's stock state is drawing 65 amps, if you are seeing low voltage then my first guess would be the voltage regulator on the alternator is going bad, you might check for an alternator rebuild kit.
Also check all of your connections, make sure the electrical connections are clean and tight and that your ground straps are in good shape.
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