Greg,
Do I get this right? The bulb does not light in situ, but will light if you
touch the housing to a good ground?
The housing should be in a good ground where it is fitted! The speedo
housing should be grounded - this is done by a wire which should be trapped
under one of the nuts holding the speedo in place. It sounds like this wire
is missing. If this is the case, I would expect your oil light and headlamp
main beam warning light also not to work.
As long as your wiring harness isn't screwed up, have a hunt around behind
your speedo - there should be a black wire with a ring-shaped connector at
the end; remove one of the nuts holding the speedo retainer in place and
replace the nut with this connector underneath.
This should solve the bulb-not-lighting problem. As for the alternator
itself, I'd be tempted just to replace it, but then my electrical skills are
not super, so I am wary of delving too much into the details. Re-built
units are #25-#30 ($38-$45) in the UK if you give your old one in as
exchange, so it is not a huge expense. Remove the pulley and fan before you
hand the old one in, as (here at least) the rebuilt units don't have them on
as supplied - this can be quite a job, as they do not move willingly if they
have been there a while.
Richard & Daffy
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