Charging system

Eric Pearson said

I wil replace the wire from the connector to the alternator and hopefully it will fix the problem

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It could if the wire had broken strands in it.

Ie if the wire has 12 strands and 9 we're broken then all the field current has to go through the 4 strands and there would be a tremendous resistance at that point under load. Not sure it would account for 3v voltage drop