the issue vanished like a miracle, i did my battery relocation with some I/0 power wire made for a soldering machine and the voltage distribution increased by a lot all over the car, the lights, the idle and everything works great! i just need to replace the wire that goes from the battery to the starter for a new one...
![:D](images/emoji/happy/big_grin.gif)
But the alternator issue disappeared... thanks for the replies!