If you put a load tester on the old battery, I'm betting it will show it is
no longer capable of holding full charge when under load. Max AC puts load
on battery, battery discharge rate is greater than it's now able to intake
and hold charge, Alt output from regulator increases to try to make up the
shortage = Alt light comes on.
Suggestion: Drop by your local FLAPS and ask them for a charging system
check... most will do it free and are equipped to do so. Load test
battery, and load test alternator with AC on engine running. [be ready for
a new battery, I'm betting].
Good luck,
Grant...
On Mon, Jul 8, 2013 at 10:23 AM, Curt Raymond <curtlud...@yahoo.com> wrote:
> I hate to disrupt the airplane theorizing but I've got a car question.
>
> Friday I noticed that if I had the AC on ('84 190D) the alternator light
> would glow on my car. If I turned the AC off the light would dim and after
> a couple minutes would go out completely.
> Its pretty hot here (80F when I got to work at 8:30am) so I'd like to use
> the AC. The alternator is relatively new (February?) but the battery is
> quite old. Is it possible an old battery would cause this?
>
> Years ago my '83 240D ate 3 or 4 alternators before I finally replaced the
> battery (which was on its last legs) and it never had another failure until
> the engine died of a broken oil cooler line. I'm wondering if its the same
> thing here. The car starts fine but its an easy starting 197,000 engine...
>
> -Curt
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