LiFePO4 BMS Broken Not Turn On, Step By Step Fault Finding

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*****Tutorials*****
Wiring Up A BMS
LiFePO4 BMS Wiring Up Lithium Ion Ins...

*****Parts*****
LifePO4 Battery 12v Always use a BMS for safety. (AliExpress)
https://s.click.aliexpress.com/e/_Ab8A99

LiFePO4 BMS - Bluetooth (AliExpress)
https://s.click.aliexpress.com/e/_99cHDO

Multimeter & Oscilloscope (AliExpress)
https://s.click.aliexpress.com/e/_AVTsug

Pure Sine Inverter (AliExpress)
https://s.click.aliexpress.com/e/_A6nhVe