79 Power windows

[superman_jjs]

I have a 79 TA and for some reason the windows need time to warm up before they work.
I replaced the drivers side motor and checked the swithch but it still needs the warm up time.

What could be the cause?

THanks,

 

[superman_jjs]

relay

Does anyone know where to get a new power window relay?
Or a part number?

THnaks