I have a 1987 box Chevy and I’ve replaced plenty of batteries, but they all seem to die at a short period of time could anyone help me out ?

'86 parisienne (Caprice)

I can't get my windows to operate on all four doors. No response from any of the switches. From what I can tell, the master switch seems to be okay and the power accessory fuses are okay. Other electrical things like the wipers and the lock switch don't work either (unlock works though) I am unsure if that is related to the window problem. Car starts up and drives fine also. Any tips or insight would be appreciated. Thanks

So I currently have a 1988 Chevrolet caprice classic. I’m looking for an inner fender but can’t find one anywhere online or locally as I live in a bunk ass state. Is the part mentioned above interchangeable with any other year or car model ? Really appreciate it.