type 44 charging issues - the plot thickens

[Keith Lawyer]

I really need help on this one.

Review: '90 200 not charging, alt lite not working
when key first turned on.

I pulled the alt lite bulb and tested, it tests good
and lites when power is applied.  No visible corrosion
anywhere I can see.

Reinstalled bulb, re-connected instrument cluster.
Still no alt lite when I turn the key on.  *Pushed on
bulb from behind* (wiggle test basically) and it lit!
Ok, started car.  Still not charging.  Turned off,
turned key back to ON, no alt lite again.  No amount
of pushing/playing with or around bulb will make it
light.

Cannot get alt to charge even if revved to 3500
repeatedly.

Exciter wire connection by "jumper" post in engine
compartment looks good.  Disconnected, I do have a
ground from the alt to the connector, which I
understand is correct from reading the archives.  This
ground should become a positive once the car is
charging?

Not sure how to test for continuity from the connector
to the instrument cluster.

Why, even when my alt lite does lite, do I not get a
charge??  I'm lost altogether.

And the strange humming I'm hearing when the alt lite
does not come on - I don't think that's the ISV.  Its'
something deeper and louder.  The one time I did get
the alt lite to work, this hum went away slowly and
deliberately, like climate control shutting down - but
it wasn't.

Keith L

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