Interesting video that provides some great diagnostics for the charging system.
We all know how important it is to be able to determine the color of a wire within a wiring harness.
Once again Paul Danner simplifies even the most basic diagnosis.
If your vehicle is experiencing charging problems, it is likely the alternator, but first eliminate other possibilities such as a loose or broken alternator belt or a blown fuse. Alternators, just like any other mechanical component on your vehicle, can fail due to use and age.