After talking to a rep from American Autowire, he informed me that this was a universal harness and does not have a specific charge indicator circuit, and that he also does not know how it is affecting the power to the tach, because the tach gets its signal from the white tach wire and power from the pink circuit 39 in the instrument cluster on circuit branch 7.
So now that the heating up/melting issue has been figured out, where would a suitable point be to connect the charge indicator wire that I had initially plugged into the rear of the alternator? Could I simply wire a ring connector and put it on the red post with the power to the alternator? I'm so confused!!