i have a 2013 dodge journey SXT. i am a volunteer fire fighter so i have a mobile radio and light bar installed. when i have the regular music radio, heat/ac, the mobile radio i installed and the dome lights on the dome lights flicker. we got it mid 2014 with very little miles because it was an enterprise rental car. help!!

first, have the alternator load tested, auto zones do that free. If the alternator is OK, then have the battery load tested. If it's OK, check for wiring shorts, especially bad ground wires.

it has remote battery posts too. my friend who is a mechanic load tested it and it was fine. it might just be time for a new battery. it’s over 4 years old. it’s the same battery it had when i bought it