Turn Signals on Trailer Not Working When Running Lights are On
Question:
Hello. I have a very similar issue to what was described by a previous individual brake lights, running lights and turn signals on both trailer lights work but when the running lights are on, neither turn signal on the trailer lights, will work. What I will include for information which was not included in the other individuals issues is that both hazard lights will work on the trailer while the running lights are on, so I dont understand why each individual turn signal will not work while the running lights are on. ???? I have taken apart the 4 blade trailer adapter, including testing each contact for continuity and each one is fine. Please help if you can with this as this is very frustrating. It is a 4 wire system: Ground white, Yellow, Green and Brown wires. Thank you for your help.
asked by: James B
Expert Reply:
The most likely cause for the turn signals not to work when the running lights are on with your trailer is a bad or weak ground. It's very possible that a weak ground connection can be just strong enough to allow sufficient current for some lights to pass, but not enough for everything. With the running lights on, there may simply not be enough power to also activate the turn signal lights. Considering that all of the trailer rear light functions appear to work fine individually, this is very likely the issue.
I recommend checking to make sure your trailer connector's ground is secured to a clean bare metal surface on the trailer frame. Make sure that there is no debris or corrosion that may be preventing the required clean connection. You can also check to see that each individual light's ground is secure.
If all the ground connections look good, you should also make sure the current rating of your vehicle wiring harness is sufficient to handle the trailer lights.
Please let me know if you are still unable to find the cause of this issue and I will be happy to look into this further.
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Q&A: Working Running Lights, But No Turn Signals or Brake Lights On Trailer
- Shop: Vehicle Tow Bar Wiring
- Shop: Trailer Wiring
- Shop: Trailer Hitch
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Video: Roadmaster Brite-Lite Wiring Converter Installation - 2003 Fleetwood Discovery Motorhome
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Video: Review of Hydrastar Brake Actuator - Electric-Hydraulic Brake Actuator - HBA-10-252-82
- Shop: Curt Universal Tail Light Wiring Kit for Towed Vehicles
- Shop: Karrier ST205/75R14 Radial Trailer Tire - Load Range D
- Shop: Hydrapro Alpha G-1600 Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi
- Shop: Fifth Wheel Hitch
- Shop: Roadmaster Brite-Lite Wiring Converter
- Shop: LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Oval - Amber Lens
- Shop: LED Trailer Clearance or Side Marker Light with Reflex Reflector - 2 Diodes - Amber Lens
- Shop: etrailer Hitch Pin Alignment Collar for Hitch Accessories - 2" Hitches
- Video: Excalibur Tires and Wheels 319EZ Review
- Article: Trailer Wiring Diagrams
- Video: B&W Companion 5th Wheel Trailer Hitch Review
- Video: Reese Fifth Wheel RP83002 Review
- Video: Curt Fifth Wheel 16721 Review
- Q&A: Compatibility of Roadmaster Wiring Converter with LED Lights
- Q&A: Replacement Atwood Gas Detector 36719
- Q&A: Replacement Clearance Lights Needed for GLO-BRITE 122R and 122Y Lights
- Q&A: Turn Signal on Trailer Stops Working when Headlights are On
- Video: Trailer Hitch Installation - 2000 Honda CR-V
- Shop: Vehicle Air Mattress
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Search Results: splice
- Shop: RV Covers
on Wiring
Thamus J.
2/22/2024
Running light on passenger side blinker not working only blinker but blinker doesn’t work on that side if running light are powered