My first thought was to stand back from this one . I dont know about electric fuel pumps and who knows what else. Then I got to thinking... That brown wire on the starter relay you mentioned is supposed to go to the neutral safety switch on automatic trans. The relay shouldn'yt work without it. Is it possible that your starter is running contiuously ? That would explain the high voltage.
the solid state regulator does need to be grounded well , even if done with only one screw. Scratch away paint or whatever to provide a good chassis ground.
