2011 Ford Fiesta 1.2 zetec Battery light

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Naldo
Fixes: 6
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Problem added: May 9, 2018 (2 years ago)
My battery light goes on and off itermedit so i called AA he checked battery and alternator both fine so booked it into ford garage and was told alternator fault so got new one but problem still persists so they then told me it was ecu but would cost £1500+vat so i sourced a second hand one from the same car as mine which is in working order so went back to ford garage and they coded it into my car but problem is back anyone any ideas what it could be coz i dont think FORD have

Car details
Car: Ford Fiesta
Variant: 1.2 zetec
Model Year: 2011
Category: Electrics, ECU, Warnings & Lights

Recalls: Ford Fiesta Recalls
More: Ford Fiesta Problems
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whittingehame
Fixes: 12,408
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May 9, 2018 (2 years ago)
Is it the original battery ? ( unlikely ) If replaced is it correct type ? Was battery and alternator LOAD tested ? If wrongly diagnosed by Ford you should have claimed back alternator .Check all earths , especially from power unit to body .
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Naldo
Fixes: 6
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May 9, 2018 (2 years ago)
Yes original battery until ford gave me new one today as they said they smelt sulphar when running car with the other ecu in and yes i got my money back for altarnater
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whittingehame
Fixes: 12,408
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May 9, 2018 (2 years ago)
Also check wiring / connections at alternator .
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Naldo
Fixes: 6
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May 9, 2018 (2 years ago)
Yes all wiring checked at alterntor by ford and AA
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whittingehame
Fixes: 12,408
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May 9, 2018 (2 years ago)
Is it o.k with new battery fitted today ? Smell of sulphur can also be caused by overcharging alternator as well as dud battery .
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Naldo
Fixes: 6
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May 9, 2018 (2 years ago)
Also when battery light comes on i lose my heated windscreen if that helps?and taking it to ford again so will get them to check the battery they told me first time i went they have never had a fault like this ever before
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whittingehame
Fixes: 12,408
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May 9, 2018 (2 years ago)
Get them to LOAD test alternaor . The heated rear window usually draws a helluva lot so would tie in with alternator not up to scratch .Have they scanned for faults ?
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Naldo
Fixes: 6
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May 9, 2018 (2 years ago)
Yes its been scanned for fault all pointed to a altarnater fault thts why they fitted new one and when out test driving the battery light came back on thts when they said it must be ECU unit but cost 1500+vat so i got one from same car as mind as i was good working order ford coded it in ran it for a hour or so no fault then i drive home from work fault appears
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Derbyshire
Fixes: 223
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May 12, 2018 (2 years ago)
Check that the car has a good earth contact.
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Naldo
Fixes: 6
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May 12, 2018 (2 years ago)
Yes all wires and contecters replaced ford have now told me to take the car to them again there going to take new alternator out and replace it with one out of there cars they have on court yard as they have never came across a fault like this before
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whittingehame
Fixes: 12,408
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May 12, 2018 (2 years ago)
I once had 2 new alternators direct from my parts dept that were faulty .Third one o.k But that was the only time in a lifetime in the motor trade .COULD be a dud they fiited .Let's know how you get on .
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Naldo
Fixes: 6
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May 13, 2018 (2 years ago)
Will do cheers
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