Sounds like you are missing a good ground.
Here's something to try. There should be a single black wire on the connector for the master window switch. this is the ground for all the windows. check for power by back probing that wire with the connector plugged into the switch and a window switch in either the up or down position. If you see 12 volts than the ground is bad. Use a jumper wire from that wire to a known good ground. If the windows start working than you will need to trace that wire to find the break. The most common would be in the harness in between the door and the body of the car.
If you don't see 12 volts with a switch in the up or down than remove both connectors from the switch. test continuity between the pin that the black wire goes to an any pin that the 8 wire connector plugs into. There should be continuity. If there isn't that the master switch is bad.
If you have any question let me know.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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