Troubleshooting Trailer Tail Lights Not Working But All Other Lights Are Working Normally
Question:
What would make all the lights work but the tail lights
asked by: Fanessa R
Expert Reply:
If just the taillights on your trailer are not working, but the turn signals and brake lights are you will want to start with finding if the issue is on the tow vehicle or trailer.
Using a circuit tester like # PTW2993 test the 11 o'clock pin if you have a 7-way connector on your tow vehicle, or the pin right next to the ground pin if you have a 4-way connector as shown in the included diagrams. You will need to have the head lights of your vehicle on for this pin to have power.
If you do not have power the issue is on the vehicle side and is more than likely a blown/missing fuse. Check the engine bay fuse compartment to verify that the fuse is installed and not blown.
If you do have power, then the issue is on the trailer side. I would start with checking that the trailer connector does not have any debris or corrosion in it causing a connection issue.
Next check that all of the running lights have a solid ground that is not loose and is connected to bare metal. Some lights ground through the mounting hardware so you will need to make sure they are bolted to metal if this is the case.
I included a link to a helpful article on wiring for you to take a look at.
(click to enlarge)
(click to enlarge)
Products Referenced in This Question
Product Page this Question was Asked From
Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket - Vehicle End
- Trailer Wiring
- Trailer Connectors
- Vehicle End Connector
- Plug Only
- 7 Round - Blade
- Pollak
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