My rear fog light is not working I have put in a new bulb but still does not work?
May 16, 2026 at 6:12 AM
Rear fog light issue?
THORE
- MEMBER
- 2 POSTS
What to check next
Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
The owner-reported ground repair is the outcome to retain. If the problem returns, verify the actual lamp and trailer wiring and test the ground connection under load before replacing more parts.
Guidance references and applicability
Source discussion: question 1712752 https://2carpros.com/questions/rear-fog-light-issue--1712752 Supports the reported history and outcome only. Follow-up guidance is editorial synthesis; unverified specifications and diagnoses are not adopted. Fluke: Diagnosing voltage drops https://www.fluke.com/en/learn/blog/automotive/electrical-automotive-troubleshooting Supports loaded feed and ground testing. Use matching wiring and vehicle-specific test limits.
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This car does not show a rear fog light, is it after market?
May 17, 2026 at 9:27 AM
I figured it out, the grounding wire, from my trailer hitch, just needed to be cleaned using electric spray cleaner. Now the light works.
May 17, 2026 at 3:55 PM
Glad you could get it fixed, thanks for letting us know.
May 18, 2026 at 7:08 AM
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Discussion summary
Rear fog light issue?
The owner reported that a rear fog light remained inoperative after bulb replacement. The owner later identified a trailer-hitch ground connection, cleaned it with electrical cleaner and reported that the light worked.
Reported outcome: The owner reported restored light operation after cleaning the trailer-hitch ground connection.
The lamp's factory or aftermarket configuration and exact ground location were not established. This is not a wiring-location guide for other vehicles.