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my V10 has been struck down with the dreaded flat battery for no reason syndrome. Its the second time in two months and I can find no reason- or sense from the dealer. Any clues?
 

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Had exactly the same happen to me on friday morning , it was going into dealers anyway due to airbag light staying on !
AA came out with jump leads and it fired up.....Up to dealers and they had it all day. AA had checked out the charging system and all was okay ! Garage fixed the airbag fault ( connections under drivers seat ) but said they couldn't check out the fault as they had had the battery on charge but it wasn't fully charged when I picked it up and they need it fully charged to check it out ...

Its going back in on Wed and Thurs because the sunroof is leaking. Seemingly VW have a recall on this but I've never had a letter through the door... The mechanic who fixed the airbag fault is very good and he is pretty convinced the "Non Starter " is due to water from sunroof in electrics running down the front pillars .

He says he'll know more when he's stripped the roof lining out to repair the sunroof , but he said they have had similar and it was due to earthing or whatever !

Seems a bit strange to me how two batteries can discharge themselves over a period of 10 hours !

If you haven't got a sunroof then I'd be very interested as to what the outcome of your problem is . I'll keep you posted as to my outcome come Thursday but knowing the garages in Dublin I'll be lucky to see it back for the weekend !

Had plenty time waiting in the garage to have a good look at the Q7 Audi albeit on Tv and brochure ...... V10 will be going if they dont sort out these silly problems...

PS Dont get me started about tyres.............
 

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QUOTE(nickband @ Nov 21 2005, 06:57 PM)my V10 has been struck down with the dreaded flat battery for no reason syndrome. Its the second time in two months and I can find no reason- or sense from the dealer. Any clues?
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I Dont quite understand,av10 has two batteries and can be started from either.Starter battery cannot go flat!vehicle battery can,and for many reasons.Advise return to dealer to obtain reason.
 

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The fact the batterey went flat is one thing, the reason is another. All V10's have a backup battery for starting if the consumer battery is flat.The start procedure is unlock the door with the key turn on the ignition, if nothing turn off then on again sometimes twice and it should fire up. There should be no need to call anybody.

The consumer battery being flat well where do we start, loose connections on the consumer battery under passenger seat, chaffed earth lead. There was a recall on some older models where the park brake pedal was catching on cables adjacent to tranmission tunnel under the dash. Also the radio drawing current when the ignition was off. I now always switch my radio off ie the whole unit. The battery is a Absorbed Glass Mat battery sometimes one cell goes down and this causes problems. It is always at this time of the year at these temperatures to check the volt meter before starting this will give a good clue as to how the battery is holding up it should be 12 volts or just below. The battery should be charging when running at 14 volts.
 

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Just in case anyone asks what's an AGM battery.

AGM (Absorption Glass Mat) sealed battery technology was originally developed in 1985 for military aircraft where power, weight, safety, and reliability were paramount considerations.

AGM battery technology has continued to develop and offer improvements over other sealed battery technologies. AGM technology has become the next step in the evolution of both starting and deep cycle sealed batteries for marine, RV, and aviation applications. This "next generation" technology delivers increased safety, performance, and service life over all other existing sealed battery types, including gel technology.

In AGM sealed batteries, the acid is absorbed between the plates and immobilized by a very fine fiberglass mat. No silica gel is necessary. This glass mat absorbs and immobilizes the acid while still keeping the acid available to the plates. This allows a fast reaction between acid and plate material.

The AGM battery has an extremely low internal electrical resistance. This, combined with faster acid migration, allows the AGM batteries to deliver and absorb higher rates of amperage than other sealed batteries during discharging and charging. In addition, AGM technology batteries can be charged at normal lead-acid regulated charging voltages, therefore, it is not necessary to recalibrate charging systems or purchase special chargers.
 

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Discussion Starter · #6 ·
QUOTE(pilgrim @ Nov 22 2005, 08:22 AM)The fact the batterey went flat is one thing, the reason is another. All V10's have a backup battery for starting if the consumer battery is flat.The start procedure is unlock the door with the key turn on the ignition, if nothing turn off then on again sometimes twice and it should fire up. There should be no need to call anybody.

The consumer battery being flat well where do we start, loose connections on the consumer battery under passenger seat, chaffed earth lead. There was a recall on some older models where the park brake pedal was catching on cables adjacent to tranmission tunnel under the dash. Also the radio drawing current when the ignition was off. I now always switch my radio off ie the whole unit. The battery is a Absorbed Glass Mat battery sometimes one cell goes down and this causes problems. It is always at this time of the year at these temperatures to check the volt meter before starting this will give a good clue as to how the battery is holding up it should be 12 volts or just below. The battery should be charging when running at 14 volts.
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QUOTE(pilgrim @ Nov 22 2005, 10:02 AM)Just came across this..... for battery faults.....

http://forums.clubtouareg.com//files/vw.tb.91-05-03.pdf
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In the US, there have been about four causes that seem to drain the battery:

A couple are to do with the alternator grounding and corrosion. Most people can see the in-dash voltmeter below 14v when running for this.

The nav unit had dodgy sw that kept fans running causing drain.

The compass module has been know to cause excessive drain (faulty module or sw as I recall).

John.
 
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