I've searched on this issue before, but everything I have found to be a cause of it I have already fixed.
I have a flickering-type issue with my 03 SVT. While at idle, my lights on my dash, map lights, brake lights, etc flicker (kind of, they never actually go out, but they pulsate between bright and dim). I have replaced my battery, alternator (new, not rebuilt), alternator connector (pigtail), and battery terminal connectors. I had Auto Zone check out my battery and alternator, and they said both were good. All my grounds seem to be tight and clean. I am at a dead end on this...any insight would be greatly appreciated.
2003 Infra-Red ZX5 SVT - Cheap Spectre intake (don't judge, was on there when I got it), Hawk HPS pads front/rear, Russell SS lines, Goodyear Eagle GT 215/45/17
"If guns cause violence, then all of mine are defective" - Ted Nugent