It's hard to answer your question without knowing which adapter you bought, maybe something like this:
But, what you're trying to do will probably not benefit you using the Ford Mobile EVSE, even if it worked. Better to pull the four prong NEMA 14-50P cordset out of the Ford Mobile and replace it with the conventional three-prong 120V house plug that is supplied with the Ford Mobile. Both will be very slow, even if using 120V TT-30.
Tesla's Mobile Connector may allow 120V charging through one leg of the 14-50 (adapter's pin diagram) and Ford's may not:
But, what you're trying to do will probably not benefit you using the Ford Mobile EVSE, even if it worked. Better to pull the four prong NEMA 14-50P cordset out of the Ford Mobile and replace it with the conventional three-prong 120V house plug that is supplied with the Ford Mobile. Both will be very slow, even if using 120V TT-30.
Tesla's Mobile Connector may allow 120V charging through one leg of the 14-50 (adapter's pin diagram) and Ford's may not:
