* Under the hood in the underhood fuse block: This is the most common location. The fuse block is typically located near the battery. You'll need to consult your owner's manual or a wiring diagram specific to your Tahoe's year and trim to identify the correct relay. The relay itself might be labeled, or you might need to trace wires to confirm.
* Inside the passenger compartment fuse block (under the dash): This is less common but possible on some 1999 Tahoes. Again, your owner's manual or a wiring diagram is essential for pinpointing the correct relay.
To find the relay, you absolutely need:
1. Your owner's manual: It will have a fuse and relay diagram.
2. A wiring diagram: A Chilton's or Haynes repair manual, or an online resource like a website specializing in automotive repair information, will have detailed wiring diagrams showing the fuel pump relay location and circuit.
Without the owner's manual or a wiring diagram, trying to locate the relay by guessing is highly discouraged. Incorrectly manipulating relays or fuses can cause further damage.
