To find it, you'll need to consult your owner's manual or a wiring diagram specifically for your 1991 Dodge Ram. These diagrams will show you the relay's location within the underhood fuse/relay box or, less commonly, inside the cab.
General Tips for Finding it:
* Underhood Fuse Box: This is the most likely location. The fuse box usually has a cover with a diagram showing the location of fuses and relays.
* Relay Identification: Relays are typically square or rectangular components. The diagram in the fuse box cover *should* identify the fuel pump relay (sometimes labeled "Fuel Pump" or similar). You may need a test light or multimeter to verify.
* Online Resources: Search online for "1991 Dodge Ram [your specific model] fuse box diagram". Many websites offer free diagrams. Make sure the diagram matches your year and model precisely.
* Mechanic or Auto Parts Store: If you're still having trouble, a mechanic or parts store employee can help locate it.
Important Note: Before working on any electrical components, disconnect the negative battery terminal to avoid accidental short circuits.
