Why does my radio have power but no sound?
Check each set of wires and speakers to be sure no wire or lead is connected to a chassis ground. The radio will see this as a short and turn off the internal amplifier causing the on but no sound issue. Each speaker connected to the radio needs dedicated positive and negative leads from the radio to each speaker.
Why isn’t my Kenwood radio working?
If the radio will not turn on, first check the fuse located on the back of the radio. If the fuse is burnt, replace with a fuse of the same amperage rating. The guide to replacing the fuse can be found here.
How do you reset a Kenwood KDC bt21?
While holding the eject CD and volume buttons, locate the reset button, which should be at the top left corner of the stereo. Hold this button down for 10 seconds. Once the stereo starts to boot back up, release the buttons.