[JAO]

It is very noticable at idle- it does not go away when I increase the rpms and hold it-but is slightly less noticible. The only things on are the headlights and the inside courtesy lights.- The pulsing is very consistant.
You mentioned an upgraded alternator. Shortly after I bought the car the alternator went bad and I bought a duralast from auto zone- just because they were close by. Is that a poor quality part?

Belts are tight, checked connections everything is tight.
Just installed a new constant voltage regulator for my gauges- they work now. No other work has been done to it recently.

Thanks for any advice