wont stay started!

maddi01maddi01 Member Posts: 2
edited February 2020 in Saturn
i have a 2006 saturn vue, my dash lighs have always been kinda dim on one side but after awhile my battery kept dying and Anytime i turned my volume knob it turned down when i tried turning it up and up when i tried down sometimes, my battery would go dead all the time (later learned i needed new battery) my friend tried replacing my radio because my car died and then when i jumpstartted it the radio no longer turned on, so when trying to replace the radio my speedometer randomly stopped working along with my power steering, lock buttons, and inside lights, my head lights still worked, i hooked my old radio back up and it now works agian and replaced battery but car will only start for maybe 3 seconds and then shuts off. was thinking maybe BCM?
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