But the battery is charging normally I guess.

The battery just flat out because I let 2 weeks in the gps tracker on, so, I made a slow charge and now is working flawless. Just the light management is on all the time, just go off if I put high been light. I dont know, but for me is a stupid problem.

Is there a way to check if the problem is the reg/rect? I tested the charging system, when is around 3.000rpm, the power output is around 13.4V.