Running Lights and Turn Signal Not Working on One Side of Trailer
Question:
I have a tacoma with 4 flat going to 5 on the trailer. I have passenger side turn signal working and break lights. Right turn and running lights do not work. Please point me in the right direction. Also harness is new at both vehicle and trailer. thanks
asked by: Bob S
Expert Reply:
On the trailer side is the 5 indicating that it is a 5-Way flat connector or that it is a 4-Way with 5 wires? On a 5-Way flat the 5th pin is usually for an electric reverse lockout on a surge coupler so it would not have any effect on the lights. If it is a 4-Way with 5 wires then that is a wishbone harness which means that the running light pin has 2 wires, 1 for each side of the trailer, for running/tail lights.
Since some of the lights are working and some are not it could just be a ground issue which is very common on trailers. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light but can show up any time.
Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces.
The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.
Product Page this Question was Asked From
Hopkins Tail Light Converter with 4-Way Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- 6 Feet Long
- Universal Fit
- 4 Flat
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Which Wires Are Used When Installing Marker Lights On Trailer
- Article: Trailer Wiring Diagrams
- Shop: Trailer Wiring
- Shop: Quick Fix (TM) 4 Pole Flat Trailer End
- Q&A: How do LED Sidemarker Lights Wire in to Trailer Light Wiring
- Shop: Hopkins Fold-Over Mounting Bracket for 4-Way Flat Trailer Connector
- Shop: Bauer Products 4-Way Trailer Plug Holder
- Shop: Hopkins Tail Light Converter with 4-Way Flat Trailer Connector
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Choosing the Right Trailer Wiring
- Shop: Trailer Hitch
- Shop: 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
- Search Results: 44649
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: Tow Ready 4-Pole Mounting Bracket Installation
- Shop: Brake Controller
- Search Results: 68149
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Search Results: dust cap
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: How to Determine if Trailer Axle is Not Aligned and How to Measure to Replace Trailer Axle
- Shop: Fifth Wheel Hitch
- Video: Choosing the Right Brake Controller
- Search Results: 25580
- Q&A: Wiring a Camper Shell Third Brake Light on a 2017 Chevrolet Silverado
- Shop: Gooseneck Hitch
- Article: Brake Controller Installation: Starting from Scratch
- Video: Brake Buddy Classic 3 Portable Supplemental Braking System Installation - 2009 Jeep Wrangler Unlimit
on Custom Fit Vehicle Wiring
