Dust/sandstorms would be the only thing to worry about I think, and if it is more dust than sand erosion or sandblasting wouldn't be a concern. Temperature and radiation shouldn't bother the exposed wire bundles. We put our wire bundles here through a lot of abuse and different conditions, but it is a lot easier to repair them here than it is on Mars.

Of course, electricity and I mix as well as oil and water do, so I could be completely wrong.