CHEVROLET DASHBOARD

While Driving The Radio Periodically Shuts Off For A Few Seconds And While It's Off All Internal And External Lights Flicker Randomly...

Next To It Is A Square With Three Wavy Vertical Lines With Arrow Points At The Top Of The Lines. What Does This Indicate?

My Dash Lights Won't Work, But When I Roll The Dimmer All The Way Up And The Cab Lights Come On The Dash Lights Light Up. I've...