Your best bet is to:
1. Consult your owner's manual: This is the most reliable source. The manual should have a fuse box diagram showing the fuse locations and what each fuse protects.
2. Check the fuse boxes: There are usually two fuse boxes in a 2005 Dodge Dakota:
* Under the hood: This box typically contains higher amperage fuses protecting larger components.
* Inside the vehicle: This box, often located under the dash, usually houses smaller fuses for accessories like the radio. The location within the dash can vary; sometimes it's under the steering wheel, other times under a panel near the driver's knee.
3. Look for fuses labeled "Radio," "Audio," or similar: If you don't see an explicitly labeled "Radio" fuse, look for ones that describe audio system functions.
4. Use a test light or multimeter: If you can't find it visually, a test light or multimeter can help determine which fuse is related to the radio's power circuit. Be careful working with electrical systems and disconnect the negative battery terminal before working with fuses.
Without knowing your specific Dakota's trim level, I can't provide a more precise location. Referencing your owner's manual is crucial for accurate identification.