2012 Ram 1500 Hemi.

Truck kept acting like a dead battery, but after a minute would start up. Replaced the battery (there was a dead cell in the battery). After that, truck would only start off of a jump even after driving around. Replaced the alternator and same problem, would only start after a jump.

What else could be going on? Whats the next thing I should look at?

 

Stop throwing parts at it and start diagnosing. Battery terminals and cables in good condition and tight? Any recent work done besides battery and alternator? Any codes stored?