fuse #5 on the relay panel on firewall left and above blower motor.
Buy a kit at Wal-Mart or auto parts comes with instructions
Inside the fuel tank.
Word the question properly. What is an Oldsmobile Royale?
no
under the coil packs which are located at the rear of the motor on top
Mounted on top and inside the fuel tank.
check the fuse box panel
Most GMs of that vintage with a power trunk release is located in the glovebox
In almost every engine, the oil pan is located at the very bottom of the engine.
if not your fuse, check the fan/blower relay.
on the block between the oil pan and trans pan
The correct tire size for a convertible 1972 Oldsmobile Delta 88 Royale is 225/75 R15.