Diodes are devices that allow current to flow in forward direction and block current flow in reverse direction. They are rated for Amperage carrying capacity and reverse breakdown voltage. The 3A @ 100 volts means the diode is built to carry up to 3 amps of current and withstand a reverse voltage up to 100 volts. It does not mean that they actually operate at those limits.
The Alternator works in a 12 volt system. Diode ratings must exceed those of the actual working environment to prevent nuisance failures.
Minimal rating for the diode used in #1 lead of Delco alternator is usually 1.5A @ 50 volts. The 3A @ 100 volts gives additional reserve protection.
Any of the listed Radio Shack diodes would work ok for this application. The 200 or 400 volt rated would give the greatest reserve protection.
Rectifier and diode are somewhat synonomous terms. The device is a diode. They are often used as a rectifier such as in the alternator where they convert the alternating current (AC) stator output to direct current (DC).
In the #1 lead to the alternator it functions as a blocking device to allow the alternator regulator to turn on, but block feed back voltage from supplying current to the ignition circuit after the switch is turned off.
Resistors and "idiot lights" can also be used. Diodes are easy to obtain and simple to install. The band or marked end goes toward the alternator.
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