Where is the starter on 2006 ford e350?

The starter on a 2006 Ford E350 is located on the passenger side of the engine, typically towards the bottom. Because there are various engine options for the E350 (gasoline V8, diesel V8, etc.), the exact location might vary slightly. You'll likely need to get underneath the vehicle to see it clearly. A service manual specific to your E350's engine would give the most precise location.