* Under the hood in the fuse box: This is the most common location. The fuse box itself might be under the hood near the battery or in a separate compartment. Look carefully at the diagram on the inside of the fuse box lid. The relay may be labeled, or you may need to consult a wiring diagram.
* Under the dash: Less common for the fuel pump relay, but some GM models placed relays here. Check near the steering column or other areas where electrical components are grouped.
To find it reliably:
1. Consult your owner's manual: This is the best place to start. The diagram should clearly show the location of relays and fuses.
2. Use a wiring diagram: A wiring diagram specific to your 1988 Oldsmobile Toronado will show you the fuel pump relay's location and its connections. You can find these online through repair manuals or automotive parts websites.
3. Check the fuse box carefully: Even if the diagram doesn't clearly label it, relays are often located inside the fuse box itself. Compare the relays to the diagram. Fuel pump relays are often a bit larger than other relays.
4. Trace the wiring: If you can locate the fuel pump wiring harness, it might lead you to the relay. This is more advanced and requires some electrical knowledge.
Important Note: Before working with any electrical components, disconnect the negative (-) terminal of your battery to prevent accidental short circuits.
