Ok guys, question.
My interior lights flicker whenever my 2000 jeep xj with 152,000 miles is on, but when its off, and I turn on the dome lights, they don't flicker. The headlights and fog lights (wired to their own relay) would also SLIGHTLY flicker. I got a new battery, new PCM, new grounds and its still there. The alternator was tested at autozone and it passed. But then again, so did my old battery which the dealer tested bad. I'm pretty much out of money so I need help badly.

Any ideas?