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Technical help Q & A Got A technical problem with you car? Keep it in here where the techies hang out and we will try to solve it for you!!

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Old 19-11-2009, 10:38 AM   #1
richyrich2009
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Default fiesta battery drain problems

Hi got a problem with my fiesta 2003 1.4 tdci zetec.
just happened recently and no work has been done on the car,the battery light is on all the time when the ignition is on and whilst driving.
Nothing has been left turned on.
next morning battery is as flat as a pancake (3 volts)
re-charged battery overnight and left to stand for 12 hours voltage check was 12.4 volts.
When fitted to the car and engine is running the voltage is 14.5 volts
yet the battery light is still on and the battery is flat again next morning.
Any ideas would be great
Cheers
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Old 19-11-2009, 12:33 PM   #2
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Sounds as though it may be a faulty battery and it can not hold the charge, could also be faulty alternator as if a diode or other component fails inside they can drain the battery without ignition being on, although your battery is getting a healthy reading.

Martin
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Old 19-11-2009, 12:51 PM   #3
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Default fiesta battery drain

Hi martin,
The battery after charging was ok and also when left to stand over night.
I have tried a drain test by removing the earth wire and the only thing that made a difference was when i disconnected the alternator.
Also when i put my test meter on the alternator live connector and the earth (chasis) with the live wire disconnected and the battery both wires disconnected i get a reading of 200 when testing resistance.
Which does not seem right to me.
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Old 19-11-2009, 01:07 PM   #4
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think that age fiesta is fitted with a smart charging system which is quite complicated,
look for ford smart charging system on google to understand a little more about it, and testing methods.

http://www.petercoopercarrepairs.co....t_charging.htm

there is a little breif information about the focus system, being ford i would imagine is not dis-similar to the fiesta?

hope this helps
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Old 19-11-2009, 03:14 PM   #5
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It's the rectifier side of the alternator that has packed up, not uncommon, this can easily drain your battery within an hour if bad enough.
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Old 19-11-2009, 03:52 PM   #6
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Default fiesta battery drain

Tabetha
Is that definately the problem then as a new alternator will cost me approx £200 (a bit steep) with £50 quid refund when i return the old unit.
But have not been able to source any reconditioned units yet.
I just wanna be sure before i fork out that kinda dosh
Cheers
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Old 19-11-2009, 04:07 PM   #7
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i'd say alternator is knackered (diode pack/rectifier, so charges and discharges the battery when faulty every cycle) and possibly the battery is guff too.
recon alternator should be around £50, don't bother buying brand new what's the point recon is as new.
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Old 19-11-2009, 04:35 PM   #8
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xr2wishy

best price i have found a Recon for my model is £180 and cannot find anyone who has one in stock.
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Old 20-11-2009, 05:58 PM   #9
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Recon should be around the £60 mark for yours, alternatively do it yourself, easy one to do on these, hardest part is taking off!!
Pm me your exact car details and I'll see what I can get it for.
The only sure fire way of ruling this out is to disconnect it all the time and see if it stops doing it, but a bit impractical esp on your car.
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Old 23-11-2009, 06:50 PM   #10
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Thanks for the info guys.
got it sorted

Tabetha
Had to get it in a hurry and no scrapyards by me had any. so i ended up paying £175 for a brand new one. or local carparts shop had a recon one for £180. but thanks anyway
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Old 23-11-2009, 06:50 PM
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