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It is an AC Delco Calcium battery. With the 3 pin plug disconnected from the alternator there is over 14v measured accross the battery so the alternator is charging as it should but when the plug is reconnected, it stops charging. So the problem is somewhere with the smart charging circuit.

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...