On Feb 8, 2011 "Lloyd Broussard" wrote:
> Simple question, is a alternator from a '02 Miata compatible with a '91
> Miata?

Not as a drop-in.

> I have a feeling that the alternator on my 1.6 is on the way out and a local
> guy is willing to give me his '02 unit. I just want to make sure they are
> interchangeable.

The NB alternators do the voltage regulation in software, in the ECU,
while the NA ones have it built-in to the alternator.  You'd need some
kind of voltage regulation control circuit to use this one in your 91.

There are also some mechanical issues -- NB pulley is ribbed, 1.6 is
v-belt, and I'm not sure if the mounting bolts are in the same
locations.

--Ian
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