Hey guys, i've been having this problem for almost a month now.

First off, i wanted to say that I have a Brand NEW BATTERY and a REBUILT alternator with new brushes, bearings and NEW voltage Regulator! Battery connections tight and cleaned. Alternator Belt looks new and in good condition and Tight!

Heres the problem:

Sometimes my car charges fine and sometimes it doesn't charge, why?
I know it doesn't charge because the battery light on my dash board flashes.

I also know it doesnt charge because just recently bought one of those Voltomenter that plugs into ur Ciggerate ligther have that 3 indicator light: red = under 12 volt, orange = ~12 volt, green = 13+ Volt

sometimes while driving in the freeway, it would just be red! and my battery light comes on, and dash board light is dimmed and then i drive it a little more then its green again and my battery light is off and so its charging again!

Just today, drove it to school with the battery light constantly on and flashing and voltomenter indicator light on RED (not charging)....when i get outa school, it's back to normal again.

I can't find any pattern of driving habbits that causes these, sometimes it happens while parked and idle, sometimes on freeway, sometimes on innner roads, sometimes with headlights on, sometimes with it off!


Same thing happened 2 weeks ago before i changed my battery and got my alternator rebuilt, after i did it, i thought i fixed it because the problem went away, until yesterday...why???

PLEASE HELP!
THnx guys

1997 2.8 Z3