Alternator charging advice

Thanks for the reply Jim. I had another old alternator in the garage, was not sure if it worked or not...but I swapped it out anyway to try it.... My readings are now 12.5 at idle and with the engine reving it does not go above 14 volts but holds above 12.5 with lights on.
When the shop changed the pulleys could they have damaged something inside the alternator? Maybe I will have them check it again.
Thanks
AL