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The big question on this one is where did the rebuilt alternator come from (I assume it is rebuilt) and what was wrong with the old one. If you had a complete failure on the old one that is one thing. However you may have never actually tested it like you are with the new one. Lower voltages can be systematic evidence that there are either cable problems or poor battery connections or maginal battery but is most likely a marginal alternator. Have it load tested to see how many amps it delivers by the place that you bought it and see what they say.
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