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It will depend on which alternator is taking the load, assuming it is not paralleling. It could be either one or both. Start by inspecting the field wires for any suspect connections. Compare resistance on each regulator and determine if it is one. If both are the same it could also be in the control board (I think your model has this).
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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