The 2007 Dodge Ram doesn't have a second fuse box in the traditional sense of a separate, easily accessible box like some vehicles do. Instead, it has several fuse and relay centers distributed throughout the vehicle. What you might be thinking of is a secondary location for fuses and relays *within* the main underhood power distribution center (PDC). This PDC is usually located in the engine compartment, often near the battery.
To find the fuses and relays for specific circuits, you'll need to consult your owner's manual. It will have a diagram showing the location of the PDC and a fuse/relay panel legend identifying which fuse or relay corresponds to each circuit (lights, power windows, etc.). There might be fuses or relays tucked away in other areas as well, which your owner's manual will also detail.
