Battery OK but warning light is red

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markg9@yahoo.com - 21 Sep 2007 14:42 GMT

The dash battery warning light goes on and off for a few weeks now.
The battery shows 12.7 with engine off and 13.8 when engine is on.
Any ideas ???

Thanks
Mark
2000 GT 'vert

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Les Benn - 21 Sep 2007 16:16 GMT

> The dash battery warning light goes on and off for a few weeks now.
> The battery shows 12.7 with engine off and 13.8 when engine is on.
[quoted text clipped - 3 lines]
> Mark
> 2000 GT 'vert

yep the alternator is not charging. check the voltage out of the alternator,
look for a slipping belt. look for a bad ground. get the Alternator tested.

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Richard - 22 Sep 2007 02:51 GMT

> > The dash battery warning light goes on and off for a few weeks now.
> > The battery shows 12.7 with engine off and 13.8 when engine is on.
[quoted text clipped - 4 lines]
> > 2000 GT 'vert
> yep the alternator is not charging. check the voltage out of the alternator,

Wouldn't that be the 13.8v reading with the engine running? Now it may be
that the alternator output should read higher like 14+v but I wouln't think
that 13.8v would trip the low battery light.

Richard

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Mas Plak - 22 Sep 2007 16:59 GMT

>> > The dash battery warning light goes on and off for a few weeks now.
>> > The battery shows 12.7 with engine off and 13.8 when engine is on.
[quoted text clipped - 12 lines]
>
> Richard

if the alternator was out, the battery should be about 13.2 or less with
the engine running

The fact that the voltage goes up a volt when the car is running means the
alternator is working some, as it is putting out some voltage/current.

How long you had the battery?

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markg9@yahoo.com - 26 Sep 2007 17:34 GMT

> >> <mar...@yahoo.com> wrote in message
> >>news:1190382124.181114.287080@w3g2000hsg.googlegroups.com...
[quoted text clipped - 24 lines]
>
> - Show quoted text -

Well, I guess the warning light doesn't lie.
I got stuck yesterday 20 miles from my house. AAA guy came and
determined that the alternator was kaput (and in turn the battery was
dead). I got a lift to nearest dealer and shelled out $280 for new
alternator and another $90 for battery). Lesson learned :-(

Still don't know why the battery kept showing high voltages up until
the last day. I assumed (wrongly) that if I was indeed running
completeley off the baterry, it would have drained quickly and made
starts sluggish.

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Ironrod - 05 Dec 2007 07:10 GMT

Its been a while since I've had to work on my electrical system so my
information might be a little out of date, but where the hell do you live
where you have to fork out that kind of money for those parts!?

> > >> <mar...@yahoo.com> wrote in message
> > >>news:1190382124.181114.287080@w3g2000hsg.googlegroups.com...
[quoted text clipped - 35 lines]
> completeley off the baterry, it would have drained quickly and made
> starts sluggish.

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