Found live 12v wires

Any control switches, monitors mounted on side(s) of island (overhead lights/LP detector etc.) that aren't working?

Have you identified which DC fuse wire is feed from.......anything else on that circuit? If not pull fuse and kill that circuit

Very normal. Some auto manuf do the same thing. It may not seem right, but they are not dangerous.

Probably for the water ionizer that is optional.
Dave