To find the location, you need to consult your owner's manual. This is the most reliable source of information. The manual will have diagrams showing the location of both fuse panels and what each fuse controls.
If you don't have the owner's manual, you can try searching online for a digital copy specific to your year and model. Searching "[Your Dodge Ram Van Year] Fuse Box Diagram" will likely yield helpful results.
Without knowing the year and model of your Dodge Ram van, I can't give you a precise location.