2020 Ford Transit electrical system problems

The battery's junction box in the engine compartment is melting. While I was driving, I heard a loud pop, I opened the hood, and saw smoke coming from the junction box. I noticed the box was melting around a fuse. The melting is significant, and the vehicle looked to be on fire. The smoke stopped, but I feel the vehicle could easily have caught on fire completely. There are recalls for this same exact issue but for other Ford Models. I have a fleet of these vans, and this has now occurred to 6 of them.

Noticed that a pump (fuel???) was cycling on when driver door was opened and when key was inserted in ignition. Parking lights also turn on when door is opened. The pump has also cycled on for no apparent reason after engine has been turned off. Checked battery which is located under driver seat and found that electrical cables that lead to seat have been damaged by rivets holding swivel seat when the seat is moved forward and back. Carefully moved the seat back guiding the cable bundle under the rivets.