Check the drive belt tension and wiring connection at the alternator and at the battery. Check for a blown fuse in the fuse block . -hope this helps
Alt may be putting out 15.1 volts but what about the amps?
if the diodes are bad it wont charge, also have the battery tested, if its bad it wont take a charge,and you could also have a bare wire grounding out the alt!!!
and on your newer cars they wont run without the battery being hooked up!!
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