There's NO diode needed or used in the lead to the regulator's #2 "voltage sense" terminal.
The #2 wire IS intended to be at battery voltage at ALL times, engine running or not, as it is the "voltage sense" lead. It will NOT drain the battery.
It is the #1 terminal that MUST be powered down at engine shutdown.
Installing a diode in the lead to the #2 in the reverse-biased position would result in NO voltage sensing and the alternator OVERCHARGING by at least a couple of Volts.
Installing a diode in the lead to the #2 in the forward-biased position would drop the voltage to the #2 terminal by the voltage drop across a silicon semiconductor junction (about 0.6 Volts) causing the regulator to increase the charging voltage by about that amount. (0.6 Volts above the regulator's normal setpoint.)
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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