new alternator - still flat battery :(

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johnd444wph
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new alternator - still flat battery :(

Post by johnd444wph »

Bought a new altanator from accuspark fitted it , it charges battery when on tester and incar voltmeter is sitting a about 3qauters of the way up when reving it , but soon as turn off leave it for a few hours the battery goes flat , much help please :(
80s kid
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Re: new alternator - still flat battery :(

Post by 80s kid »

johnd444wph wrote:Bought a new altanator from accuspark fitted it , it charges battery when on tester and incar voltmeter is sitting a about 3qauters of the way up when reving it , but soon as turn off leave it for a few hours the battery goes flat , much help please :(
Is the battery ok? Mines as limp as an old mans fart. The alternator works but it dont hold the charge like it should.
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Re: new alternator - still flat battery :(

Post by johnd444wph »

Battery is few months old been fine untill changed altonator I put plug on rong way on back of alternator tho at first then because it didn't charge turnt it round now it charges it but as if. The battery don't hold now when off ? Could I of fucked battery putting it round rong way ?
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Re: new alternator - still flat battery :(

Post by pbar »

Jesus Christ, is English not taught in schools any more!
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Re: new alternator - still flat battery :(

Post by stevemarl »

If it`s charging OK, which it IS as the Ammeter is showing a heavy charge, then the alternator is OK. Also the battery is probably Ok as knackered ones tend NOT to take much charge.
Which means the most likely thing is a wiring problem, something is staying on & draining battery. You need to disconnect battery and reconnect through a meter (current range) (DON`T START IT LIKE THIS) and see how much current is flowing when ignition is off, should be a couple of mA. Any more and you need to look for boot light staying on etc etc
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Re: new alternator - still flat battery :(

Post by stevemarl »

pbar wrote:Jesus Christ, is English not taught in schools any more!
Now there`s a topical issue.... :lol:
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Re: new alternator - still flat battery :(

Post by johnd444wph »

Ok thanks will check that and yeah I failed english but I can talk it perfect who needs to be able to right english never got me a job n I've been working since was 16
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Re: new alternator - still flat battery :(

Post by Bug »

johnd444wph wrote:Ok thanks will check that and yeah I failed english but I can talk it perfect who needs to be able to right english never got me a job n I've been working since was 16
I guess you mean 'perfectly' ????? :doh:
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Re: new alternator - still flat battery :(

Post by johnd444wph »

Thinking its the plug if I put it in the correct way it wouldn't charge put it in over way and it reads that it charges but obv don't car was fine before changed it gona cut plug off n wire it up my self see what happens
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Re: new alternator - still flat battery :(

Post by vp-reynolds4 »

Okay an issue I had was a deeply discharged battery. Modern car battery’s deeply discharge and alter the weighting of the acid level in the battery. This basically means the battery will appear to charge but lose charge on its own terms quickly with no draw. The only way to re-weight the acid level is to "bubble" the acid by overcharging it. Many battery chargers will bubble the battery but that takes hours. You’d have to drive halfway up the country and back for an alternator to charge it fully. Even then the battery needs about 15v to bubble which an alternator shouldn’t throw out anyway except for the occasional spike. Charge the battery on a mains charger overnight on a concrete floor away from everything else by at least a meter in a well ventilated dry area. Re install the battery and I’d bet it sorts itself out golden. As a side note the longer you leave the battery incorrectly weighted the worse the charge will become. The acid weights at the bottom and eats at the internal plate structure. Once it had undergone enough corrosion don’t expect it to charge again.
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Re: new alternator - still flat battery :(

Post by stevemarl »

johnd444wph wrote: gona cut plug off n wire it up my self see what happens
That REALLY doesn`t sound like a good idea - you could destroy the alternator.
vp-reynolds4 wrote:The acid weights at the bottom and eats at the internal plate structur

Acid isn`t in suspension like dust, the molecules won`t sink to the bottom like that. Apart from that, you`re right - stick it on a mains charger overnight, well vented, and it will probably make a big difference.
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Re: new alternator - still flat battery :(

Post by vp-reynolds4 »

stevemarl wrote:
johnd444wph wrote: gona cut plug off n wire it up my self see what happens
That REALLY doesn`t sound like a good idea - you could destroy the alternator.
vp-reynolds4 wrote:The acid weights at the bottom and eats at the internal plate structur

Acid isn`t in suspension like dust, the molecules won`t sink to the bottom like that. Apart from that, you`re right - stick it on a mains charger overnight, well vented, and it will probably make a big difference.
Well no it doesnt sink to the bottom. I just used a simple explanation.
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Re: new alternator - still flat battery :(

Post by stevemarl »

You`re thinking specific gravity?
Anyway the point is - you`re right, he needs to get the battery on a charger overnight/24hrs & see how that goes, certainly before cutting up the wiring!!
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Re: new alternator - still flat battery :(

Post by vp-reynolds4 »

Agreed!!!! No cutty the coloured wobbly pipe thingies!
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Re: new alternator - still flat battery :(

Post by johnd444wph »

Didn't cut it its gota be the alternator when plugged in one way /correct way it don't charge but turn it over so it don't fit properly but does kinda it charges lovly but draws power when not being used ,poxy thing
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Re: new alternator - still flat battery :(

Post by Mc Tool »

Not to sure what you plugged in the wrong way , but it is possible to damage a diode in the alt and this can cause a battery to flatten , As stevemari sez a couple of Ma, if its much more than that unplug the alt and see if that makes a difference .Standby current should be no more than your clock and stereo , GPS. Its not unheard of for a new battery to crap out :)
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Re: new alternator - still flat battery :(

Post by Toecutter »

As above, it is possible the battery got boiled due to improper or faulty voltage regulation. What was the problem with the old alternator? Was this battery used with the old one too?
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Re: new alternator - still flat battery :(

Post by johnd444wph »

Forgot to reply turned out to be the alternator bulb was blown I must of blew it when plugged it on wrong or it was loose I Carnt remember but that's what it was lol
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Re: new alternator - still flat battery :(

Post by pbar »

That was three years ago?! Still, kudos for concluding the thread and explaining the issue, many don't bother.
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