Headlights make radio display dim?

[Still Bill]

Hello-

1998 Ranger. When headlights are turned on, the display on the radio gets very dim. Is this normal? If not, suggestions for fixing?

 

[little red ranger]

Sounds like your alternator make not be pushing all the volts it should,,, maybe should have it tested and tell them to load it heavy to make sure

 

[adsm08]

Sounds to me like the dash's dimming feature is working. Turn the dimmer switch up.