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 - What Price Enthusiasm? - by Anthony West. Quite frankly, for some time now restorers like myself have become more and more concerned about the rapid increase in the prices of old farm machines here in England. There is now a growing market for "As found" machines. Which as machines get rarer, has found the birth of a new industry....one of the "procurement agent". These agents appropriate as much old machinery as possible then inflate prices at auctions. So at what price enthiusiasm? We are now seeing poor machines which 3 years ago ma
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