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Depending on the amperage rating of the alt and pulley speed some cars do not charge at idle. If it happens above 2000 rpm there is not enough alt output that could be caused by bad alt, bad regulator or a bad (high resistance) connection on any of the positive or ground wires. A bad battery could cause hi current draw from the alt not leaving enough left over for the fan. Testing each component is the only way to know.
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