Hey, Im currently puttin my motor back together and i installed a used pfc i got. Well Ive got it pretty much all together and i wanted to hook up a battery so i can play witht the functions on the pfc. I just grabbed a old batt and hooked a battery charger to it, well when i turn the key to acc. I get the lights on the commander to turn on but there is nothing on the screen. Perhaps if the batt is too low it doesnt show or maybe if something is not connected? Any insigh would be greatly appreciated.

 

Depends on what voltage the battery is putting out.