Alternator woes

[cpginkpt]

Noticed some significant fraying in this cable which led to the alternator. (exhibit A below)
Disconnected battery.
loosened the nut to replace cable and the whole bolt assembly popped away from the plastic (Exhibit B/C below)

Assume this is just an insulated junction box (and NOT a ground) since the bolt the wires connect to lays in the plastic bed and does not seem to have any connection to the body/big nut other than the plastic insulator ????

Can I just secure the nut back into the plastic (using RTV?) and triple wrap the whole thing in electrical tape until I can find a replacement box - or am I missing something in this setup?


***have also read the "Alternator Woes" thread several times for clues (exhibit 4)