Re: [DML] How does the Alternator light work???
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Re: [DML] How does the Alternator light work???

Those same thoughts crossed my mind as well about how it works. I havent had
the time to go over the schematics yet but i do plan to do so. However if
the bulb did work how you explained, which to me seems the most logical and
efficent way to check something like that. However if it did work that way
the alternator should still work if the bulb goes out. But when the bulb
does go out the alternator and the rest of the charging system starts acting
up. Just my thoughts.


On 8/30/07, daviddlasvegas <daviddlasvegas@xxxxxxxxx> wrote:
>   My curiosity has been peaked with all this electrical system trouble
> I've been having. I'm wondering if anyone can tell me exactly how the
> alternator tell tale light works.
> Here's what I'm thinking: There is a positive wire from the battery
> that goes to the light. The negative wire from the light goes to the
> alternator. When you turn the key on, the alternator is not making its
> own power yet, so the juice goes thru the light and is grounded at the
> alternator. Thus the curcuit is complete and the light illuminates.
> Once the alternator is on and making power, it can't act as a negative
> and the circuit is undone and the light goes off. When the ignition is
> turned on at first it takes a few seconds for the alternator to start
> making power, so the light illuminates for a few seconds (while the
> manual says this is a bulb check it's really just electricity working
> the way it is suppose to).
> So how close am I???

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