Here goes, replaced original alternator in May 2014.
Later in fall noticed interior light pulsing or flickering.
In January of 2015 the headlights started to flicker when slowing down appx. 1000 rpm and down.
I cheated 5 years ago and I altered the headlight switch so the fog lights were on whenever I turned any lights on.
I cleaned the ground wire(s) I could find in the engine compartment. Cleaned the frame wire twice.
The garage I took it to found my alteration and a blown fog light fuse.
They checked voltage output with all items running on high. Voltage speced out 14.0 I believe.
I replaced alternator again under warranty. Still flickering.
I found a thread here that suggested the tensioner (original) be replaced, did belt, tensioner, idler.
Still flicker.
I am next checking the interior grounds-where and how many?
Any other thoughts?
Headlight switch maybe?