Was this likely a problem with the alternator?

I know someone was just staring at my profile, waiting for my 1,001st car question lol.

I saw a utility van driving down the road during overcast and their headlights were flashing. I know it wasn’t being done manually because it was at a steady, continuous pace and because the lights would [b]slowly fade[/b] on instead of just turning back on.

In other words, they would turn off, then [b]fade[/b] into the “on” state, and repeat, at a rate of about twice per second.