Why is my radio not turning on?

• The Radio is not getting proper power and grounds. Red (ignition input) Yellow (constant 12-volt input) Both need to be connected for our radios to work properly. Use a multi meter to be sure the red wire has 12 volts while the key is on and the yellow wire has 12 volts at all times.
• Be sure the Black ground wire is connected to a clean metal point near the radio.
• Be sure both shafts are plugged in securely.