I'd imagine that the regulator buzzing *would* change to some extent with
engine speed as the output from the dynamo varies with engine speed, so more
regulation would be required at higher engine speeds/dynamo outputs than at
low. The same thing happens as the battery becomes charged - the amount of
regulation increases to reduce the average current being pushed through the
battery. But as I mentioned before I wouldn't expect to hear it over the
engine normally, I haven't had a dynamo-equipped car for many years but
don't recall it when I did. To me a loud buzzing from the control box would
imply a problem, but you would need to determine which of the 2 or 3 relays
it was coming from.
PaulH.
----- Original Message -----
> I asked because fairly recently, I started noticing a buzzing noise
> that appeared to be coming from the bulkhead and was dependent on
> engine speed. I had never heard this before (or rather, never noticed
> it), so I was wondering if it implied that the regulator was fautly in
> some way.
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