Mechanical shop needed for Charging issue

[RASCARS]

Hello again,
It has been a rough weekend!

I didn't want to bury this in my last posting.

I also need a very reliable and knowledgeable Corvette specialist in Miami-Dade or Broward Counties. I have a 93 Convertible with 70K. Overall it is a nice car.
I am having an unusual situation with my alternator.
The Volts meter in the car is riding between 15 and 18!
I don't know what means exactly, but I know it ain't supposed to be there!

If anyone has any suggestions, I would appreciate any and all suggestions.

Thanks
Bob