Check closely at the point where the blue wire connects. Some had a
spade connector there and others had a tiny threaded stud.

Mark

George Goff wrote:
>
> I have two alternators one from an '84 and another from an '89.  They are
> both rated 14V/90A.  One is numbered: 025 903 023C; the other: 025 903 023E?
> They both look identical right down to the pulleys.  Does anyone know if they
> differ in any way?
>
> George