Electrical help of blown melted fuse on battery

[KHAUS41369]

Hi im trying to help out a friend who has no clue about eletrical. Has a 2013 whitehawk 26 DSRB.everything works with shore power or connected to truck...batteries dont charge. He has a blown fuse and melted holder on one of his 2 green wires. Shown in pic below. What do the 2 green fuse wires goto?? I cannot find any prints and tracking these are a biotch. He has power tongue jacks and leveling jacks.

[Jagiven]

One goes to the converter box, the other probably goes to the electric tongue jack.

If I was a betting, the melted fuse goes to the tongue jack. To big of a fuse, for the wire. Better off to install an auto resting circuit breaker.

What is the fuse rating, of that melted fuse? If you do not know what color is it? The little bit I see, I suspect it is a 70 amp fuse (amber/tan). If it is a 70 amp fuse, he is lucky only the fuse holder is damaged.

There should be a non fused wire for the emergency brakes.