Oldrav4

car stopped, lost all power while driving. whats wrong and what fix ?

This probably in the archives as surely others have had the same annoyance but I cant find it in a search. I want to disconnect the feed wire that allows the seatbelt to beep awarning if not connected.Or/and the one that beeps when door open with keys in ignition. Probably under the seat for power and the speaker seems to be under dash on drivers side if my hearing is intact.