When a 500e shows 47% on the gauge it usually means there is no power from the HV battery pack.
The car won't go into "D", & it won't charge, right?
If so, we'll get more help if we discuss it on a thread with an appropriate title, like maybe this one:
I just acquired a dead 2014 500e with 48,000 miles. The previous owner said one day it would not charge using the OEM EVSE. At some point they installed a new 12v battery which did not solve it but might have been the beginning of all this. Then...they let it sit for 10 months. Details: Will...
www.fiat500owners.com
But I attached pics of how to try checking the HV pack, no yellow adapter needed: