Where is the glow plugs on a 2000 ford f250 power stroke?

On a 2000 Ford F-250 Power Stroke 7.3L, the glow plugs are located on the top of the engine, one for each cylinder. They're relatively easy to access, but you'll need to remove some parts to get to them (likely some wiring harnesses and possibly parts of the intake system). A good quality repair manual specific to your year and engine will show the exact location and provide instructions for accessing them. Be prepared for some heat, as they're near the exhaust manifolds.