A diode is a device that passes current in one direction and blocks current in the opposite direction. It is used with a Delco alternator to pass start up current but block reverse current that would allow an engine to continue running after the switch is turned off.
A diode has two ratings, forward current and reverse voltage. For instance a diode rated 3 Amps @ 50 volts means it is rated to conduct up to 3 amps in forward direction or withstand up to 50 volts in reverse direction without failure.
Delco start up current is less than half an amp. I have done a number of alternator conversions and have done several with 1.5A @ 50 volts and experienced no diode failures. Higher amp or volt ratings just give extra reserve protection.
The marked band signifies the cathode or negative end and has nothing to do with amp or volt rating.
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