Common locations to check, but not guaranteed:
* Under the hood, in the fuse box: This is a very common location for relays. The fuse box often has a diagram on the inside of the cover showing the location of the relays. Look for one labeled "Fuel Pump" or something similar.
* Inside the passenger compartment, often under the dash: Some vehicles place relays in a less accessible location within the cabin.
* Behind a panel near the fuse box: Sometimes relays are tucked behind access panels near the main fuse box.
To find it effectively:
1. Use your owner's manual: This is the best starting point.
2. Look for a wiring diagram: A repair manual (like a Haynes or Chilton manual) will have diagrams showing the location of all the relays and components.
3. Search online: Search for "1990 Plymouth Colt fuel pump relay location" including your specific engine size (e.g., 1.5L). There might be forum posts or online resources that have pictures.
4. Use a multimeter: If you're comfortable with basic electrical testing, a multimeter can help you locate the relay by tracing the fuel pump circuit.
Caution: Always disconnect the negative battery terminal before working with electrical components in your vehicle.
