* Under the hood in the Power Distribution Box (PD Box) or Fuse Box: This is the most common location. The fuse box is usually located in the engine compartment, often near the battery. The relay itself may be labeled, or you might need to consult your owner's manual or a wiring diagram to identify it. Look for a relay that's associated with the fuel pump or fuel injection system.
* Inside the passenger compartment fuse box: Less common, but possible on some models. This fuse box is usually located under the dashboard, often near the steering column. Again, check your owner's manual or a wiring diagram.
To find it definitively:
1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location of all relays and fuses.
2. Use a wiring diagram: A wiring diagram specific to your 1994 Mercury Cougar (including the engine type) will pinpoint the relay's location and its connections. You can find these diagrams online through auto parts websites or repair manuals.
3. Visual inspection: Carefully examine both fuse boxes. Look for a relay that is similar in size and shape to other relays in the box and may have markings suggesting its fuel pump function.
Caution: Always disconnect the negative battery terminal before working with electrical components in your car to prevent accidental short circuits.
