You could use various tools and testers but you already have everything you need to track down your problem.
You had your battery charger hooked to the motor and it worked when you supplied power to the terminals.
Move the ground from your battery charger to a good ground point not on the door and see if it still works, if it does ground circuit is good, if it doesn't you have found your problem.
If the above did not solve the problem then move onto the switches.
Simple 3 wire circuit
Power comes in on pink wire then goes out to motor through one or the other for up and the other for down.
Leave the ground where it was from the previous test and apply battery charger power to the other 2 wires (one at a time) at the switch plug terminals and see it the motor responds, if it does on both then you have confirmed the wiring from the switch to the motor is good.
Next would be the switches
Supply 12 volt from your charger to the pink wire with everything else connected. Both windows should now function up and down, if they do not then you have a switch problem.
If switches test OK then move on to power supply, check the little tin can breaker in the fuse box, if you do not have a spare you can temporarily substitute a fuse of the same value for test purposes, if the windows now work then the breaker is bad.
All of the above tests are based on connecters already being checked for cleanliness and tightness.
If they still are not working then supply your charger power right to the breaker terminal in the fuse box, if they work now but not without the charger connected then it is time to check the back of the fuse box for loose or burnt connections.
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