* Color Codes Vary: Wiring harness color codes aren't standardized across all vehicles or even all years of the same vehicle. A slight variation in manufacturing or a previous repair could easily change the colors.
* Potential for Errors: Incorrect wiring can damage your fuel pump, the vehicle's computer, or even cause a fire.
You MUST use a wiring diagram specific to your 1998 Chevy Tahoe. This diagram will show you the correct wire functions and which color corresponds to which function on your vehicle's side and the new harness side.
How to Find the Wiring Diagram:
1. Repair Manual: A Haynes or Chilton repair manual for your specific year and model Tahoe is your best bet. These manuals usually have detailed wiring diagrams.
2. Online Resources: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts often have online repair guides or wiring diagrams you can access for free, though you might need to create an account. Search using your vehicle's year, make, model, and engine size.
3. Factory Service Manual: A factory service manual is the most comprehensive but usually the most expensive option.
Important Considerations While Wiring:
* Power: Identify the power wire(s) carefully. Incorrect connection can lead to a blown fuse or worse.
* Ground: The ground wire needs a good connection to the vehicle's chassis.
* Fuel Pump Relay: The fuel pump is often controlled by a relay. Make sure the relay is functioning correctly.
* Testing: After connecting the wires, test the fuel pump operation carefully. Never work on a fuel system with the engine running.
Without a wiring diagram, attempting to connect the wires based on color alone is extremely risky and not recommended. Get a wiring diagram before proceeding. If you're not comfortable with automotive electrical work, take your Tahoe to a qualified mechanic.
