Eternal theme, alternator V50 2.0D

Hi dear community, my 04’er V50 now has around 190tkm on the clock and the LiMa spins. Neither the battery is charged nor does it give a voltage of itself. The on-board network then sinks piece by piece depending on the switched on consumers until nothing works anymore… The alternator is already the second one that has been installed… Question: Can I check the connections of the LiMa? Will Marderdamst, cut-off cables or anything else exclude. knows someone exactly where the connections a n lead the plug or even its assignments? Thank you for your efforts!!!