Thank you very much friend Julio Cesar Torres! I suspected something of that I told you to install the fourth cable with my mechanic and re-produced the fault I will check the ground cable or directly then I thank you very much>! As I doubt I tell you how it was then that it worked on the first cable for more than a year? Thanks again for your time. Tomorrow I check.
"As it is then that the first cable worked" the ground connections often begin to fail, the fault may be of a false contact, which allows a small loss of current, but these failures are growing, until the contact is made quite bad, and the current tries to go through the gualla, being this steely behaves like a resistance, generating high temperature in it.