installed a functional battery as in just one? just because you think the engine is turning over fine doesnt mean there is enough reserve energy to keep the ECU happy in the voltage department. id do 2 batteries or 1 good battery and jumped off another diesel at least....
if the cp3 is healthy ive seen several trucks start up with no
LP (if there is enough fuel in the tank to create gravity pressure.
the alternator has nothing to do with cranking. if it died after a minute of running and the dash went crazy i would bet money on an electrical issue. dash problems themselves are normally in the 06's but the truck still runs fine because the dash is just receiving signals, not computing them so to speak. someone correct me if im wrong.
do you have a way to log RP while cranking?
after you get known GOOD batteries in there, unplug the FCA and try again
-Marcus