Trailer Clearance Lights Blinking with Turn Signal
Updated 07/31/2013 | Published 07/27/2013
Question:
I have 2006 GMC HD2500 and usir to haul several trailers. One is 5th wheell, two cargo trailers, and a boat trailer.. The 5th wheel uses a 7-pin connector. The other trailers use a 4-pin flat adapter to the same truck 7-pin. Ive pulled all 3 for several years with no problems. Recently I noticed the older carge trailer clearance and tail lights flicker when either turn signal is on. I then noticed the same thing on the 5th wheel. However, on the boat trailer they seem to work fine. I have checked the ground as best I could. Even wirined temporarily directly from battery to trailer body. Still flickers. Any suggestions?
asked by: Roger
Expert Reply:
It sounds like you might be getting some bleed-over from the turn signals occurring in the trailer connector. Take a look at the trailer connector, and check the plug for corrosion in the sockets. If you see any green or white corrosion in the sockets, then there is a good chance it has spread to the interior of the connector, to where the wires attach to the plug terminals. Once this corrosion starts building up, it can actually contact adjacent terminals and cause signal bleed-over. You would also want to check the adapters for corrosion, as well.
You can also make sure that the trailer connector on the vehicle is properly grounded. Make sure the connection is tight and not corroded.
I have linked you to a trailer wiring troubleshooting FAQ article that you might find helpful.
Product Page this Question was Asked From
Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side
- Trailer Lights
- Tail Lights
- Brake/Tail/Turn
- Marker
- Square
- Surface Mount
- Submersible Lights
- LED Light
- 5L x 5W Inch
- Red
- Optronics
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: etrailer Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 5,200 lbs to 7,000 lbs
- Shop: Trailer Hub and Drum Assembly - 5,200-lb and 6,000-lb Axles - 12" - 6 on 5-1/2 - Pre-Greased
- Shop: TecNiq Side Marker with Reflector - 2.5" - 4 LED - Round - Amber
- Shop: TecNiq Round Side Marker Light - Amber - 2-1/2" - Grommet Mount
- Video: All About the Demco Trailer Coupler
- Video: How to Install the etrailer Electric Trailer Brakes on a 2009 Carriage Cameo Fifth Wheel
- Video: A Closer Look at the Demco Cast Black Trailer Coupler with Adjustable Channel and eZ-Latch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K
- Shop: Terran Industries Electric Trailer Brakes - Self-Adjusting - 12" - Left/Right Hand - 6-7K
- Shop: Trailer Hub and Drum Assembly - 6,000-lb Axles - 12" Diameter - 6 on 5-1/2 - Galvanized
- Q&A: All Trailer Lights Flash When Using Turn Signals and Running Lights
- Video: Review of Demco Adjustable Trailer Coupler - eZ Latch Channel Mount Coupler 2 Inch Ball - DM12688-95
- Video: Review of etrailer Trailer Brakes - Electric Drum Brake Kit - AKEBRK-6
- Video: Review of Shocker Hitch Adjustable Trailer Coupler - Channel Mount Coupler Only - SHK73RR
- Video: Review of Demco Adjustable Trailer Coupler - eZ Latch Coupler Only - DM15791-97
- Q&A: Foam Gasket For Optronics MCL0032 Series Marker/Clearance Lights
- Article: Trailer Wiring Diagrams
- Article: Trailer Lighting Requirements
- Q&A: Recommended Baseplate for a 2002 Jeep TJ Sport
- Q&A: Idler Hub For A 3,500 Pound Axle And 5 On 5 Bolt Pattern 15" Wheels
- Q&A: Recommended 5th Wheel Hitch for a Short Bed Truck w/a Turnover Gooseneck Hitch
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Q&A: Solution for Needing Replacement Caliper for Kodiak 204 Caliper
- Q&A: What is the Best Grease for Trailer Bearings
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Trailer Maintenance Schedule
- Article: Holiday 2025 | Staff Picks for Real-Life Adventures
on Trailer Lights
