This "w" terminal is used in diesel models, as a signal for the tachometer.
With out this signal you need to provide a signal from a distributor
to run the tach., whitch diesels obviously don't have.
                                                         ERic

Matt Heydon wrote:

>Group Members:
>
>I have an '87 Weekender with a failing alternator. My mechanic (who is
>trustworthy & knowledgeable) has a replacement for me BUT without the "W"
>connector. My current alternator has this "W" connector with a light blue
>wire running from it up to the relay next to the aux. battery under the
>driver seat.
>Can anyone tell me what the function of this is?
>
>Many thanks,
>Matt Heydon
>
>
>
>