No picture, but the answer is likely to be that there is either a worn or sticky brush in the generator. If it is a three brush gen, the two brushes that are opposite of each other provide output to the A post from one, and ground to the end frame on the other. the third brush picks up voltage for the field, and the field is grounded through the light switch (if old non regulator system, or through the regulator to ground if regulator based system. Brushes can hang up in the holders, or be worn and not touch reliably, or have broken springs or leads.
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