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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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