19V is WAYYYY too High......This is a shot in the dark but inspect the connectors possible replace also make sure you are getting a good solid ground A bad ground with the regulator will cause the regulator not to work at all and you will actually be using the full voltage from the stator
Same thing will happen if one of the wires are broken somewhere down the line
So I would have to say check the wiring get a schematic and a test meter and get er done
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