My observation is that flickering alternator light is a good indication that it’s time for brush replacement.

Jim

> On Jan 2, 2016, at 6:32 AM, Jim Felder <jim.felder@gmail.com> wrote:
> 
> I make a point to keep the connection clean and filled with electrical
> grease at the alternator after having a troublesome drive home on a long
> trip with flickering alternator light once. It does pay to go through that
> weak link once in a while. I keep a small diamond file on board for the
> purpose, you never know when you are going to need it on a 30+ year-old car.
> 
> Jim