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Author Subject: Battery explosion
heliosphan

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Registered: 14 Sep 2007

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Post #1
is something that can happen when the alternator & voltage regulator are not working correctly and overcharge the battery, no? The sulphuric acid boils away/erupts, I've read, and the battery becomes useless.

What is the ideal/correct voltage that an alternator should supply to a battery at idle? 14.8 volts?

I've just fitted a new alternator and measured both 16.5 or 18.5 volts on the two separate occasions I've put the multimeter across the terminals.

This is not for a GTi, it's an '03 Clio dCi: is the ~14.8 volt ideal universal for all cars or do some vary wildy?
Posted 27th Jan 2014 at 20:16
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buzzbrightyear

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Post #2
Yes it Sounds very high, but better off doing a search on the specific car tho, as modern fords have something called smart charge which charges the battery at a higher voltage to usual and a silver calcium battery is specified to handle the extra volts, although whenever I've years mine it's always been around 14.8-15 volts, maybe it goes up with revs f**k knows.
But I would of thought that if it wasn't ment to charge at that high a level the battery light would be on to show a fault, but what do I know? Not much!

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 27th Jan 2014 at 20:44
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buzzbrightyear

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Post #3
By the way I'm very disappointed with this thread I was expecting something special like pics of the title and description of how, when it happened

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 27th Jan 2014 at 20:45
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AndyJ

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Post #4
And a death. A death always livens a thread up.

Andy, what helmet do you have? On Your picture it looks like it's some kind of face, or is it just the light?

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Posted 27th Jan 2014 at 20:52
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thugpuggin

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Location: Bristol

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Post #5
He's got his Stan the Ban man face on.

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Posted 27th Jan 2014 at 20:56
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AndyJ

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Post #6
No worries, zoomed in on pic. All clear, now.





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PS£ ID: Monkey369

Posted 27th Jan 2014 at 21:11
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heliosphan

Senior User

Location: UK

Registered: 14 Sep 2007

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Post #7
buzzbrightyear wrote:
By the way I'm very disappointed with this thread I was expecting something special like pics of the title and description of how, when it happened


Don't lie, you love an anticlimax. Just like my girlfriend.

Old alternator had just one main post terminal marked B+.
New one has two: B1+ and B2+. Tried both and checked voltage again, now up to ~19.5 volts.

When it reaches 40,000 I'll notify the national grid and request subsidies.

Posted 27th Jan 2014 at 22:04
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #8
19.5v is definitely way too high. Yes

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Posted 27th Jan 2014 at 23:38
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rallyeash

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Post #9
stan_306gti6 wrote:
19.5v is definitely way too high. Yes


If its 24v then it's not charging up well...Dunno

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Posted 28th Jan 2014 at 00:05
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #10
rallyeash wrote:
stan_306gti6 wrote:
19.5v is definitely way too high. Yes


If its 24v then it's not charging up well...Dunno


Since when has an '03 Clio had a 24v electrical system? Blink

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
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Posted 28th Jan 2014 at 07:03
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scotzman

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Post #11
Its not just the battery that's going to explode, you're going to fry everything else too.

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Posted 28th Jan 2014 at 07:20
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heliosphan

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Location: UK

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Posts: 948

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Post #12
Guess what it was.

Nope.

The 9v battery in the multimeter was low and causing it to read high.
Now the car battery is 12.8 at rest and 14.5 at idle.

"Oorah!", as the American special forces would exclaim.
Posted 28th Jan 2014 at 11:34
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scotzman

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Post #13
Haha, should have guessed, mine did the same about 2 weeks ago and I only realised when I checked it on a spare car battery in my garage.

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'90 1.6 205 GTi, '98 306 GTi-6
Posted 28th Jan 2014 at 11:38
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #14
Glad this is sorted, was a bit worrying constantly getting higher! Laugh

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 28th Jan 2014 at 18:18
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buzzbrightyear

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Location: hiding all receipts for car

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Post #15
tompaltridge wrote:
Guess what it was.

Nope.

The 9v battery in the multimeter was low and causing it to read high.
Now the car battery is 12.8 at rest and 14.5 at idle.

"Oorah!", as the American special forces would exclaim.

That's excellent news butLOL how can it be 12.8 at rest and 14.5 at idle?
does your car have a rest mode that mine doesn't?
Also you didn't change the alternator due to the multimeter battery did you? that's something I'd do LOL

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 28th Jan 2014 at 21:09
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Niall

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Location: Epsom

Registered: 06 Jun 2012

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Post #16
buzzbrightyear wrote:
tompaltridge wrote:
Guess what it was.

Nope.

The 9v battery in the multimeter was low and causing it to read high.
Now the car battery is 12.8 at rest and 14.5 at idle.

"Oorah!", as the American special forces would exclaim.

That's excellent news butLOL how can it be 12.8 at rest and 14.5 at idle?
does your car have a rest mode that mine doesn't?
Also you didn't change the alternator due to the multimeter battery, that's something I'd do LOL


Yeah turn the key anti clock wise and it sings a lullaby to the car and in a split second, its resting at 12v Big grin
Posted 28th Jan 2014 at 21:09
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buzzbrightyear

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Post #17
LOL ahh I see LOL

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 28th Jan 2014 at 21:11
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #18
He means not running...LOL

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 28th Jan 2014 at 23:02
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