You can get a wiring diagram for a 1997 Cadillac Seville STS at Wiring4Cars. The site lets you search for diagrams by year, make, and model.
Tell me where the turn signal flasher is on a 1996 Sedan DeVille. It is behind the panel right above the headlight switch
5x120 or 5x4.75 or 5x4 3/4 bolt circle
First answer is correct for the 1976-1977 Seville.
By the Time the 78-79 cars rolled out of the factory the bolt spacing had been changed to 5x5 or 5 bolts at 5" apart on center and the cars has adopted rear disc brakes, general rule of thumb with 1st gen Sevilles is if you have rear disc brakes it is 5x5, if it has rear drum brakes it is 5x4.75. The early 5x4.75 bolt pattern was a coincidence of the car being made from Chevy Nova underpinnings.
that depends on what kind of engine you're trying to get. Domestic? Foreign?
first check fluid if ok sounds like pump is not working or filter is clogged