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Light behaves as designed... (archive)

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Posted by Jon on January 24, 2002 at 11:25:34:

In Reply to: Battery Light/Idle High posted by Ryan on January 23, 2002 at 12:07:58:

If you mean to say that the light goes on when the ignition is on but the engine is not running, that is the proper function of the light. On most people's cars, the light will stay on after starting the car until the rpms are raised slightly. That's because the alternator is not charging enough at idle to make the light go out.

Your high-idle makes it so the alternator is charging enough to put out the light whenever the motor is running.


Hi everyone! Haven't posted here for a long time. I still have a couple of problems with my '89 M3 (imagine that).
First things first. I just recently had my alternator rebuilt because the diodes were fried. After installing it, my battery light goes on only when the car is off. When I turn on the ignition, the light goes off. I can't really tell if this was a problem before, as when the alternator went dead, the three lights went on including the battery light. Any thoughts as to what might be causing this problem??

Also my idle sits at about 1100 rpms. It has done this since I have owned the car. I replaced the intake manifold gaskets last summer, and I don't think I have a vacuum problem (engine idles smooth). Any thoughts?

Thanks for all your assistance.
Ryan (no longer in SoCal, stuck in rural Oregon for now)

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