To find the correct wire, you must consult a wiring diagram specific to your 1998 Chevy truck's year, make, model, and trim level. These diagrams are often available online (though their accuracy can vary), or from repair manuals like a Haynes or Chilton manual. You can also find them at your local auto parts store.
Looking at the wiring harness itself and tracing the wires to the parking light bulb sockets might be necessary as well. Use a test light or multimeter to verify which wire is active when the parking lights are switched on. Always disconnect the battery's negative terminal before working with automotive wiring.
