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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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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