I have 2011 Nissan Juke. I recently had an after market radio installed. There was no rewiring done harnesses were used for the install. After the install the next day my battery and brake light came on and I immediately lost power and the battery was gone. I took it back to the company who installed the radio. They checked for issues with wiring but found none. They did check and found the alternator was bad and the battery had a dead cell. I replaced the battery and the alternator only to have the same issue. Today I had the alternator replaced with a brand new one. Not even 30 minutes after driving the lights flashed on again. All forums say it's a bad alternator but it can't be as I literally replaced it today. Any ideas on what other issue it could be is greatly appreciated.