"Michael Pardee" <michaeltnull@cybertrails.com> wrote
> I was lucky that both my cars that had that problem also had voltmeters. I
> noticed the voltmeter in each fluctuating as the brushes made contact and
> then didn't, but the lamps never flickered. (Sometimes they wouldn't come
> on before start-up when the brushes were wearing out.) Talk about "idiot
> lights!"

Would you say watching the voltage across the battery terminals of an idling
car might also likely pick up bad brushes?