How to diagnose & replace a bad starter motor

This video shows a step by step process that I used to diagnose and replace an intermittently failing starter motor on my 1998 Dodge Ram. Battery load testing and voltage drop testing are demonstrated, to help rule out other causes that might appear to be due to a bad starter motor. Both battery load testing and voltage drop testing are dynamic tests, putting the battery and wiring under active load to expose very common hidden problems. For an inside look at my old starter motor, see this followup vi