I have had this problem as of recent. The problem is that when I rev the engine over 4500rpms my battery warning light turns on and also my e-break warning light. I noticed that near 4800rpms the battey warning light dims out. The battery gage is a little over 12v and does not drop. Another problem that I have noticed is that when I push on the breaks the my headlights somewhat flicker like they wanna turn off 4 a milli-second also there is no significant drop on batt gage. Any suggestions. I was thinking it might be the alternator. I got to go 4 now.