battery light new battery and new alternator
 

i have an 01 with 4.4. battery went out so got a new one at auto zone. couple weeks later got trans failsafe mode then check engine and battery light and after forum search checked voltage and was barely over 12 volts running. Changed alternator and now battery light is still on. took it to local shop and he tried hooking up to obdII port and said the only thing comunicating was DME and it had no faults.
Anybody ever have obdII not comunicating problems??

you might need to replace battery too since it got probably drained or have electrical components too.

i dont think it ever drained very low. ive been keeping it on a charger since the problem started