This tech paper will discuss the disassembly, diagnostics, and repair of GM Delco alternators used after 1971, and specifically discuss the alternators used from 1971 to 1986. Alternators used after 1986 are similar (called the “CS” alternators), and the same troubleshooting techniques/principles apply. However, disassembly techniques are significantly different for the CS units due to the Stator wires being crimped & soldered to their mating components. Pre-’71 alternators are also similar, but do not have an internal voltage regulator, and use individual diodes in place of a diode trio and bridge rectifier. Alternators fail frequently, and good rebuilt units are pricey (typically in the $150+ range). But virtually any alternator can be easily repaired for less than $50. You can do it yourself in your garage or driveway using ordinary hand tools and a little knowledge.