Good afternoon,
My girlfriends '00 Olds Alero keeps throwing on the battery light. It appeared to happen at random times, only while driving.
Idle voltage is good, mid to high 13's, if I remember correctly.
We had the battery and charging system tested at a shop by some complicated machine that ran through a number of tests. Everything checked out just fine.
About a week later, we learned how to duplicate the problem... All you have to do is slow down to a lower speed, and accelerate with more than half throttle or so. Either that, or just bring the tach over 3500-4000 rpm.
I tried to read the voltage out of the cig-lighter while my g/f drove the car. It appeared that the voltage would slowly climb from low 14's, to about 14.3 or slightly higher while driving rather normally, where the battery light would decide to come on. I never solidly caught the voltage dropping off below the 13's or doing anything funny. Bumpy roads made me 'lose connection' a few times.
I'm pretty well lost from here as to what to do about this. Is 14.3 or 14.35 too high of a voltage for this vehicle?
Think it's the battery light circuit?
Voltage regulator? (Built into the alternator, right?)
The car has a 3.4L V6, w/60K miles on the clock. All connections look good. Battery cable terminals are oxidated, but not heavily corroded. As far as I know, untouched from factory.
Thanks,
-marc