To find it, you must consult your vehicle's owner's manual. The manual will have a diagram showing the fuse box layouts and identify which fuse is for the glow plugs (often labeled as "Glow Plugs," "Preheat," or similar).
If you don't have the owner's manual, you can try:
* Online searches: Search for "[Your Year] Ford Transit 350 fuse box diagram" to find a diagram online. However, be sure the diagram matches your exact year and model.
* Ford's website: Ford's website might have owner's manuals available for download.
* A Ford dealership: A local Ford dealership will have access to the correct information for your vehicle.
Without knowing the year of your Transit 350, it's impossible to give you a precise location. Checking the owner's manual is the only reliable method.