My 90 carat has developed an unwanted feature. When the engine is
running the lights in the car--all of them, dash, tail, headlights,
interior lights--pulse several times a second. It's barely noticeable,
but it's there.

Is this a sign that the alternator is going? The pulsing stays the
same no matter the RPM, as far as I can tell.

Thanks for any advice.

Jim