I found this picture that shows how it looks.

The white wire that you see connected to the ignition resistor is the exciter wire from the alternator that needs the diode soldered to it.

The BAT wire and the sensing wire from the alternator are both attached to the BAT terminal of the dummy voltage regulator.

http://s844.photobucket.com/user/ma...2981_zps673417ae.jpg.html?sort=3&o=3

Matt