Troubleshooting No Stop or Turn Signal on One Side of Trailer
Question:
Hoping I can get some expert advice on my trailer lights. All the back and side lights work but I have no turn signal or brake on one side. I do on the other. Its an aluminum trailer with wiring in frame. I have checked everything I know I can. The bulb, the wiring, the truck fuses, etc. I cant figure out why I dont have brake or turn on one side. Any help would be appreciated. Thanks
asked by: Trent
Expert Reply:
The first thing to determine with troubleshooting wiring is where that signal is lost. If it's on your vehicle side then it's a fuse or bad wiring somewhere but if it's on your trailer side then it could be a bad bulb, light fixture, or the wiring itself.
If you've tested everything but the physical wiring running inside your trailer frame then that's likely where the problem lies. Somehow that wiring got corroded or damaged and is keeping that stop/turn signal from operating properly.
To remedy this you'll need to find the bad part of wiring and replace it using new 14 gauge wire, part # SWC5362-1 sold by the foot, and I recommend using Heat Shrink Butt Connectors # DW05744-5 to give you a better connection. If you're unable to gain access to that wiring then you might consider running a whole new line from your trailer connector back to any lights on that side of the trailer connected to that circuit.
I've attached a few review videos as well as a wiring page with some diagrams for you to check out.
Products Referenced in This Question
Deka Heat Shrink Butt Connector - 16-14 Gauge - Nylon Insulation - Blue - Qty 5
- Wiring
- Wire Connectors
- Butt Connectors
- 16-14 Gauge
- Deka
more information >
Product Page this Question was Asked From
Triplex Wire with Grey Outer Jacket - 14 Gauge - Black-Green-White - per Foot
- Wiring
- Wire
- Jacketed Wire
- 3 Wire
- 14 Gauge
- Spectro
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Q&A: Kit to Upgrade 5-Way on Trailer to 7-Way
- Search Results: 7 way trailer wiring
- Search Results: 7 way connector
- Search Results: ring terminals
- Shop: Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS
- Shop: Deka Heat Shrink Butt Connector - 16-14 Gauge - Nylon Insulation - Blue - Qty 5
- Shop: Ring Terminal - 12-10 Gauge Wire - 3/16" Ring ID
- Shop: Triplex Wire with Grey Outer Jacket - 14 Gauge - Black-Green-White - per Foot
- Shop: Trailer Wiring Junction Box
- Shop: Hopkins 7-Way Molded Trailer Wire Connector - 11' Long
- Shop: Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 5
- Search Results: 7 way junction box
- Search Results: wire
- Search Results: bunk carpet
- Search Results: marine trailer wire
- Q&A: Troubleshooting A Bad Ground With Boat Trailer Lights
- Q&A: How Many Ring Terminals Are Included with Ring Terminal # 44-5310A
- Q&A: How Do I connect My Trailer With A 5-Flat To my Vehicle With A 7-Round Plug
- Q&A: Pigtail Recommendation for Use with Clearance Light Part STL22RCB for Additional Clearance
- Q&A: Dimensions for Buyers Product Wiring Junction Box # 3375601101
- Q&A: What Size Ring Terminals Should be Used with Buyers Products Junction Box # 3375601101
- Video: Spectro Wiring SWC5362-1 Review
- Video: Spectro Wiring SWC6422-1 Review
- Video: Spectro Wiring SWC5322-1 Review
- Video: Optronics LED Identification Light Bar Installation
- Video: Deka Wiring DW04914-1 Review
- Article: Trailer Wiring Diagrams
- Video: Choosing the Right Trailer Wiring
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
on Wiring
