Better take off the alternator and bring it to a technician who knows how to repair becouse if the regulater is bad the bearings and cupper slide rings inside will have their best time.If inside a diode is death you can not find it with a voltmeter becouse a alternator is a tri phase device and you will not be able to see such things on your meter.
When bussy check the wires + and - for bad connections /corrosion and hope there is nothing fried elsewhere .
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