Good news! It is now working again. Not sure what I did or how but I inserted the battery holder and batteries and plugged in the ac adapter turned on scanner inserted removed the plug a few times and it is working on battery power again. I sthere some kind of switching mechanism that could get jammed up in there?
REALISTIC PRO-53 , BEARCAT III , BEARCAT 145XL , BEARCAT 147XLT , BC 92XLT , PRO-46 , PRO-74 , PRO-2042 , PRO-2050 , PRO-2018 , PRO-89 , PRO-96(X2)