Battery Light always on

When the light first came on, I had the alternator serviced, voltage
regulator changed, etc. The repair shop told me it was all working fine now
but the light continued to shine and he didn't know why. The voltage to the
battery was the same when I took it in as when I picked up the car - around
15.3Volts. Silly me for thinking it was too high. I always thought 14.8Volts
was what it should be. Anyhow, anybody have any ideas what is causing the
light to stay on? Perhaps a relay somewhere, broken wire, etc.?? Thanks in
advance.

There is a key piece of information missing-- The model year of your Miata!
Different model years & NA vs. NB use different schemes and hardware to
control the Alternator.
In the old days, from your complaint, it would be assumed that your
regulator is suspect, or there is a wiring problem.
Some years use an alternator that is controlled by of all things, the
instrument panel module. Others have a separate regulator.
There are some variations that make the alternator year or part year
specific.
I don't even want to get into differences between US, European, Japaness,
and other market area variations.
It's also quite possible that a blocking diode is bad, and the real problem
is to find it. Finally, some Mazda models will turn on the alternator light
if a brake light bulb is bad or have a poor connection.
It's best to have a wiring diagram in hand when chasing this sort of
problem, unless you enjoy being frustrated.

"Mike" > wrote in message
news:l0vHg.452684$Mn5.56039@pd7tw3no...
> When the light first came on, I had the alternator serviced, voltage
> regulator changed, etc. The repair shop told me it was all working fine
now
> but the light continued to shine and he didn't know why. The voltage to
the
> battery was the same when I took it in as when I picked up the car -
around
> 15.3Volts. Silly me for thinking it was too high. I always thought
14.8Volts
> was what it should be. Anyhow, anybody have any ideas what is causing the
> light to stay on? Perhaps a relay somewhere, broken wire, etc.?? Thanks
in
> advance.
>
>