Electrical system Issue

[Bob C]

2013 GMC Acadia.  While driving battery light came on as well as Battery Saver mode and Service battery.  Several other lights cam on as well

Traction Control off, etc.  Lost power and oulled off road.  Had towed to shop.  Battery replaced as well as Alternator.  Drove for about 2 weeks and

now battery light and service battery, Battery low power back on.  What else could be the problem? 

[silveradosid]

you have a bad connection or bad cables