power windows wiring

Hi there,

I have a question to the wiring of my 72 Coronet Wagon.

It originally has 4 power windows installed, but the windows won't move when i press any of the buttons. I was thinking to problemshoot it, but since it's 45 years old already, i am unsure about what i should do here for a decent fix. Any suggestions would help a lot.

regards. Willem