I read some posts of similar issues, but mine does not fit what I found.

I noticed tonight my headlights and my dash gauge lights have a very slight pulse look, sometimes a slight dim effect.

not really a flicker ..nor do they go out.
Only at idle around 650-700 rpm once rpm increase to around 800+ it
stops.

See video - just above center line band of bright white light.

https://www.youtube.com/watch?v=iseQ...ature=youtu.be

Inline volt meter stays 13.8 to 14.1
The alternator is 6 mos or less old.
Battery is less then a year old.

Ideas on what it could be. ?

 

Sounds like it could be a symptom of a bad ground. I would start by checking and cleaning all your connections on your main grounds and seeing if that solves it.

 

Ive had an issue on my 95 with my lights pulsing, i was already looking to upgrade my alternator because of the lights i was going to be adding. Put in the ad244 and have not had any issue with pulsing lights anymore.

 

Had the same issue.Voltage regulator in the alt was causing it.Replace alt,good to go.