Okay, checked and have 12.1 volts at the red wire.

Got the wires to 0,1 Ohms. I find no damage to the wires, but something is odd, but for now, if it ain't broke...

Then connected the wires, tried a switch and nothing. So, jumped the connections and... It worked! Wahooooooooooooooooooooooooooo! So at least now can operate the window, which is nice for the dog as no A/C.

Again, thank y'all for the help!

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Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.