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Old 06-14-2005, 00:37   #1 (permalink)
knnymcntyr
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battery discharching while driving

hi people a pal of mine has a 3.2 auto m reg jag and his battery is
discharghing whilst driving he says the alternator is fine and has been
checked by different people , i cannot figure out whats wrong - can anyone
help please ?
regards

ken

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Old 06-14-2005, 00:37   #2 (permalink)
WayneC
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Re: battery discharching while driving

knnymcntyr wrote:
> hi people a pal of mine has a 3.2 auto m reg jag and his battery is
> discharghing whilst driving he says the alternator is fine and has been
> checked by different people , i cannot figure out whats wrong - can anyone
> help please ?
> regards
>
> ken
>

Do you mean the ammeter shows a discharge all the while he's driving?
Does the battery eventually go dead? (or could it be a bad ammeter)
Has the battery been checked?
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Old 06-14-2005, 00:37   #3 (permalink)
knnymcntyr
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Re: battery discharching while driving

hi the a - meter shows a discharge whilst driving and the battery has been
checked and also changed battery eventualy dies its flummoxed me , thanks
for your reply

regards ken

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Old 06-14-2005, 00:37   #4 (permalink)
WayneC
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Re: battery discharching while driving

knnymcntyr wrote:
> hi the a - meter shows a discharge whilst driving and the battery has been
> checked and also changed battery eventualy dies its flummoxed me , thanks
> for your reply
>
> regards ken
>


I'm no expert in this area, or this vehicle, but it seems to me that if
an alternator checks out OK (that's a BIG "if"), and the battery has
been changed (and goes dead, indicating the discharge shown by the
ammeter is correct), then the only other possibilities are the wiring &
connectors for the charging and sensing wires from alternator to
battery, or the grounding wire from the alternator's internal
regulator... or a horrific short, which is unlikely or you'd see a
constant charge on the ammeter, not a discharge. I'd believe the
ammeter, which reads the flow of current, and assume the alternator is
bad, so I'd start by removing the alternator and having it bench-checked
by a professional alternator rebuilding service.
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Old 06-14-2005, 00:37   #5 (permalink)
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Re: battery discharching while driving

Its the regulator
"knnymcntyr" <knnymcntyr@aol.com> wrote in message
news:8e59e9b8ff449ce57b72a867879fb334@localhost.talkaboutautos.com...
> hi people a pal of mine has a 3.2 auto m reg jag and his battery is
> discharghing whilst driving he says the alternator is fine and has been
> checked by different people , i cannot figure out whats wrong - can anyone
> help please ?
> regards
>
> ken
>



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Old 06-14-2005, 00:37   #6 (permalink)
Blake Dodson
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Re: battery discharching while driving

I doubt the integrity of either the alt or the Battery. A draw that
heavy would blow fuses or heat wires. The alt should charge the system
so either the regulator or the battery is toasted.

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Old 06-14-2005, 00:37   #7 (permalink)
knnymcntyr
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Re: battery discharching while driving

i thank you all for your kind help i will give everything a go and let you
know the outcome
kind regards
ken

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Old 06-14-2005, 00:37   #8 (permalink)
Jon A
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Re: battery discharching while driving

The job of the regulator is to regulate. If there's voltage going to
the battery and it doesn't hold a charge, then that's the culprit. A
battery can be charged with dead cells and still read 12V. Load test
and hydro test the battery. Remove a terminal while the vehicle is
running. If it dies, there's no juice TO the battery.

On 12 Jun 2005 22:54:10 -0700, "Blake Dodson" <dieinterim@comcast.net>
wrote:

>I doubt the integrity of either the alt or the Battery. A draw that
>heavy would blow fuses or heat wires. The alt should charge the system
>so either the regulator or the battery is toasted.


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