Sounds like a wiring problem on the blue wire circuit. Measure the
voltage on the loose end of the wire while the key is on and the light
is on.

With an 88 Westy the blue wire circuit has a leg under the driver seat,
to the fridge relay. Maybe something is wrong there.

Mark

Shawn Wright wrote:
> Hi Mark,
>
> Thanks for the info. No, the LED does not go out when I disconnect the
> blue wire. What does this mean?
>
> Thanks
>
> On Thu, Jul 7, 2011 at 8:39 AM, mark drillock <mdrillock@cox.net
> <mailto:mdrillock@cox.net>> wrote:
>
>     First, test the led circuit a little. When the key is turned on but
>     engine not started does the alt led come on? If you then go back to
>     the engine and disconnect the blue wire from the alternator does the
>     alt led turn off?
>
>     Mark
>
>
>
>     Shawn Wright wrote:
>
>         Sorry if this is a repost for some, but I didn't see this come
>         through...
>         I'm still stranded with a box of alternators and no charging... :-(
>
>         It's an '88 Westy, with 1.6TD transplant, otherwise stock, using
>         a 90A
>         alernator, back half from the original Westy unit, and front
>         half from a
>         rebuilt A2 Jetta unit. I suspect there must be an issue in the
>         van wiring,
>         but not sure where to start looking.
>
>         Thanks!
>
>
>
>
> --
> --
> Shawn Wright
>