Aaaaa this started about 2 years ago when the battery and alternater went at the same time. I put a new batery and alternater on it. The battery came from ford and the alternater from Checkers.
The lights flicker as if they were like strobe lights at a party.
and yes it has a lifetime warenty I have replaced it about 3 time since because of this problem and bought a other battery
and no the flicker gets worse when at a higher rev but let off and it starts to clam but won't.