I finally found the problem. I was doing the wiring for the wiper motor. I moved the alternator harness and blawww. Nothing. I knew where the problem was. Turn on the lights, move the harness a little, and lost everything again. That explains why I was losing all power. Vibrations.
Cables are badly damage, corrosion and dirt... The alternator wire is spliced with a bridge connector with 2 other cables; one black, one white. I think I was suppose to find a fusible link in that harness... Diner was ready so I had to leave it like this. I guess the red wire is coming from the starter, the black feeds the fuze box... The white one goes to the passenger side. Don't know what it feeds...
