Kiara t

My car is dodge journey 2015 

Hi ! 
I have had my aircon fading in and out for about a month, I notice the lights dimmed at the same time my aircon would fade. Went to get this checked 

was told battery or alternator. 
new battery nope same issue, one week past now the stereo is going on and off, two days go by now the car turns off and dash board lit up like Christmas tree and the speedo is dropping (not the speed ) Turns car back on, all normal again days go by happens again, book in alternator. Now two days later it’s still happening, AND. Now my car alarm has gone off 6 times today 😅HELP BEFORE I GO BROKE