Multiple lights coming on intermittently

My 2012 Jeep Wrangler Sport started having four lights come on and off while driving.  The ABS light, brake light, traction control light, and hill descent control warning light (I think that is the correct name).  When these lights come on my speedometer and RPM control panel drop down to 0 and then go back to normal.  I did not feel any loss of speed or power.  Also, the PRND and mileage light dims.  I had a diagnostic ran and it has a code that points to the alternator.  Had the alternator checked and it is fine.  I've had this issue since late December, early January.  I will go out and my car will not start.  No lights come on, turn the key and I get nothing, not even a clicking noise.  My mechanic said it might be electrical, but he said that is hard to find.  How can I find out what electrical issue this is?  Thank you