The new QUCC 200A BMS. Does the Relay-BMS work this time?

Thanks for the reminder. I'm finally going to replace the faulty BMS with the new QUCC BMS and different relay. The electronic looks exactly the same but the relay had an upgrade. QUCC also confirmed the balance cables would just fit again from my existing installation.
After replacing the BMS, we do a first test, which left us in the dark. So, it's working obviously.

It is also crunch-time for the old relay. In the true sense of the word...
Can we find the fault? Can we find out why the relay was not working? Can we see the contacts been welded together which so many have assumed?

The QUCC BMS (link to the newest XiaoXiang app is on this website too):
https://off-grid-garage.com/battery-management-systems-bms/

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