----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Stan,
this may be a normal reading...residual magnetism in a generator is small, but sufficient to activate the Voltage regulator. Once activitated, the voltage regulator energizes the field windings, making the rotating armature generate current, by intercepting the field windings magnetic fields......making about 13.5 volts. and 13 amps at about 2000 rpm.
With the regulator wires disconnected, there is no field winding voltage (other than this residual small voltage) to react with the rotating armature to generate output.
REgards,
Harry Francis
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