After i start my chevy malibu maxx all the

after i start my chevy malibu maxx all the dashboard lights go on, the radio shuts off and the gas gauge goes down to e.it is as if the car has lost power the car does not stall after a few seconds all the dashboard lights go out and the gas gauge is where it is suppose to be. Then it does the same thing again the dashboard lights come on the radio shuts off and the gas gauge goes down to e I don't know if it is the battery or a fuse. Do you have any ideas?