cable de masa
Que quiere decir "cable de masa" en el contexto de automoviles'
Sorry, didn't read the whole question. Always in a hurry, that's my problem.
Eddy, he is asking the meaning in automotive terms. I've never seen the term "Earth Wire" used in cars' service manuals. "Ground wire" or "ground connection" is issually used. And that's what's "cable de masa" is. The wire connected to the negative terminal of a car's battery is also called "cable de masa", or more generic, any wire connected to the negative in electrical circuits.
I think this would probably translate as "Earth Wire" in English, although the earth wire is considered as grounded.