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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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