Troubleshooting No Running Lights On 2025 Nissan Frontier Wiring Harness

Updated 08/04/2026 | Published 07/29/2026

Question:

Hello I bought a wiring unit for my 2025 Nissan Frontier 04 I installed the unit I have turn signals and brake lights I do not have running lights what may be the problem thanks a lot Rocky

asked by: Rocky C

Expert Reply:

Hey Rocky, thanks for reaching out. Since you have turn signals and brake lights, but no running lights, the first thing I would check is the brown wire connection on the wiring harness. The brown wire carries the running light signal, so if it's connected to the wrong factory wire or has a poor connection, you'll get exactly the symptoms you're describing.

Are you using a custom plug-in harness, or a universal hardwire harness? Do you know the part number? Knowing that will help me narrow down more specific troubleshooting steps.

expert reply by: Jesse M