ajlelectronics
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My mum has older Fiesta that has a problem where the battery light stays on, it still charges fine so she has lived with it and I'm too far away to put any time into it. A quick google shows it a common problem but there seems to be no definitive guide.
Usually an alternator diode. Sometimes (as in my Scorpio with the same issue) it can cause the battery to discharge more quickly than it should when left for a week or two. My alternator has been "tested" and found fault free, but I will do a substitution test in the better weather.