Battery cable hookup for slide (fuse)

[kbagley]

2004 Keystone Sprinter
While at dealership, they disconnected the battery and we cannot figure out where small black cable labeled "fuse" goes. It is connected to + positive post on battery. Any suggestions welcome.

[2011 keystone]

Maybe the trailer brake away switch?
do you have a power tounge jack?

[hankpage]

It looks like an after-market install ... do you have an electric tongue jack??? Are you original owner???

[f6bits]

That totally looks like the wire for my tongue jack.

[Andymon]

Yep, looks like mine for the tongue jack. The other end might be hanging down under the propane bottles.