To find the location for *your* specific Ford E350, you will need to:
1. Find your vehicle's year and engine type: This information is crucial. The location will vary significantly based on the year and engine (gasoline, diesel, etc.).
2. Consult your owner's manual: This is the best resource. It will have diagrams and specific information for your vehicle.
3. Use a repair manual specific to your year and model: A Haynes or Chilton manual (or similar) will have detailed diagrams and explanations.
4. Search online forums: Search for "[Your Year] Ford E350 ignition module location" on forums like Ford-trucks.com or similar. This can provide real-world experiences from other owners.
Without knowing the year and engine of your E350, it's impossible to give a precise location.