Charger current dropped to half. What is going on?

Hi

I have a home built battery, a Chinese 14S BMS and a Chinese 58.8V/7.5A charger. I recently had to resolder the charger connector wires because one of them detached. And then another.

Now I noticed that the charging seems to take unusually long time and checked (from BMS through Bluetooth) that the charging current is exactly 3.5A. I don't know if this is related to resoldering and I have no good idea what might be going on. Is the charger going bad?

Okay, I got a hint that the reason could be a bad transistor. I checked the charger output and saw 61 Vdc / 131 Vac. Need to investigate further...

This thread has plenty of information on chargers.
Thanks to dnmun
https://endless-sphere.com/forums/viewtopic.php?f=5&t=49401&p=835293#p835293

If you're getting AC (especially high voltage) on the output of the charger, there's something seriously wrong with it, and I would not connect it to any battery you want to keep.

Nevermind, I blew it up already while "investigating".