Okay so my back left window hasn’t worked since I got the truck but I decided to give it a go. I replaced the regulator and motor plugged it in and I had nothing, swapped switches and still nothing, checked all fuses relating to the windows in the fuse box and non have blown, if anyone can help me solve the issue that would be amazing

Hi, FL1 or 2 ?

Meter at the regulator to see if there is any power when pressing the switch.
Or meter at switch although I don't know which cable does what.