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If there is any difference you probably wouldn't notice it unless you ramp up the accessories (big sound system, flood lights etc.).
Assuming efficiency is the same, power drain should be directly proportional to electrical usage, so there should be no change.
Get the battery checked first though, it may be a weak battery not the alternator, if you can borrow a good battery swap it in and check voltages, if better, then battery is suspect.
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