Where is relay location on 1989 ford 5.0 bronco?

The relay location on a 1989 Ford 5.0L Bronco is in the engine compartment, on the driver's side fender. It is mounted to the inner fender panel, near the firewall. The relay is black and about 1 inch square. It has three terminals, one labeled "I", one labeled "S", and one labeled "O". The "I" terminal is the input terminal, the "S" terminal is the switched terminal, and the "O" terminal is the output terminal.