* Under the hood in the underhood fuse block: This is the most common location. The fuse block is usually located near the battery. Consult your owner's manual or a wiring diagram for the precise location of the fuel pump relay within that fuse block. The diagram should clearly show the relay's position and often label it as "Fuel Pump" or have a similar designation.
* Inside the passenger compartment fuse block: Less common, but possible. Again, your owner's manual or a wiring diagram will be necessary to pinpoint its location. The passenger compartment fuse block is usually located under the dash, often near the steering column or on the driver's side.
To be absolutely certain:
1. Consult your owner's manual: This is the best resource. The manual will have a diagram of the fuse and relay boxes, clearly identifying each component.
2. Use a wiring diagram: A wiring diagram specific to your 1996 Chevy Tahoe (year and trim level are important) will show the relay's location and its circuit. You can often find these online through automotive parts websites or repair manuals.
Without consulting these resources, giving a precise location is unreliable. Remember to always disconnect the negative battery terminal before working with any electrical components.