1. Locate the volume control knob on the radio. It is usually located on the front panel of the radio, near the other controls.
2. Turn the volume control knob to the desired volume level. Turning the knob clockwise will increase the volume, while turning it counterclockwise will decrease the volume.
3. If the radio has a remote control, you can also use the remote control to adjust the volume. Point the remote control at the radio and press the volume up or down buttons.
Here are some additional tips for adjusting the volume on a 2004 Harley Davidson radio:
* The volume control knob may be sensitive, so be careful not to turn it too quickly.
* If the radio is turned up too loud, it can damage the speakers.
* If the radio is turned down too low, you may not be able to hear it over the noise of the motorcycle.
* Adjusting the volume while riding can be dangerous, so be sure to do so when you are stopped.