My V8 was doing that a while ago. Wondered if it was brushes so bought a new
set (cheap enough) before opening it up but there was virtually no wear on
them (a minimum of 100k and quite possibly 200k!). The slip rings looked like
they could have been a bit muck so polished them and cleaned the surfaces of
the brushes and since then it has been fine - except for one instance a few
weeks ago, but I've been doing quite a lot of mileage since then and it has
been fine.
Could be poor connections in many places inside the alternator and outside it,
but not the brown/yellow as a break in that would *stop* the light coming on.
If you can catch it for long enough to do some voltage tests check the voltage
on the brown and brown/yellow at the alternator, and the brown and white at
the fusebox. The warning light will glow when there is a potential difference
between it's two terminals, i.e. a potential difference between the
brown/yellow and the white. If the brown and brown/yellow at the alternator
show, say 14v but the brown and white show, say 11v then there is a bad
connection between the brown at the alternator and the brown at the ignition
switch, which could be at the starter solenoid. If the fusebox brown shows
close to the alternator but its white is lower then check these two at the
ignition switch, it could be the switch that is faulty or connections between
it and the fusebox. If there is a significant difference between the brown
and the brown/yellow at the alternator spades, but the brown at the alternator
is much the same as the brown and white at the fusebox, then the problem is
internal to the alternator.
PaulH.
----- Original Message -----
As the subject states, my '76 B has an intermittently-flashing alternator
light....
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