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Need Help With A Charging Problem

alan666
alan666
in Ford Fiesta Club

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The battery light on a 1.4 2003 Fiesta is on constantly. When I put the battery on a battery charger/conditioner, it reported the battery was poor or sulphated and couldn't be recovered so I replaced it but the battery light is still on. I have checked voltages and the alternator was not charging so I removed the smart charge plug and it charges at 14v. I have read elsewhere that pin 3 on the Focus smart charger plug should be at the same voltage as the battery as it is a reference voltage. Don't know if it is the same on the Fiesta so I checked, but I wasn't sure which was pin 1 and which pin 3. One has around 4v the other 8v so neither has 12v. Any ideas what else I could check?

  • Quote


    There is a 3 amp fuse, which I think is fuse 28 check this as this provides battery voltage to the alternator. The wiring for the smart charge is pin 1 & 2 comes from the PCM, and pin 3 is battery voltage.

    Any problems let me know.

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    The "Digestive"

    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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