Troubleshooting Horse Trailer Interior Lights Not Functioning
Question:
I have a new horse trailer - all lights work except the interior lights. I am hooking it up to a seven prong outlet on a 2010 gmc sierra. what should I check and what lights need to be activated on the truck for these to work?
asked by: Graham
Expert Reply:
The interior lights of your trailer would be powered by the 12 volt accessory circuit on the 7-way of your 2010 GMC Sierra. You will want to check the 1:00 position of the 7-way on your truck with a circuit tester like part # PTW2993 to verify if there is voltage on this pin. If there isn't voltage on this pin you are most likely missing the 40 amp fuse in the power distribution box and/or the circuit under the hood hasn't been completed.
For more info on how to complete the circuit under your head check out the FAQ article I attached to the right. Scroll down to the Finalizing Connections for the Brake Controller Heading and then check out step 3.
If there was voltage on the circuit of your 7-way on your truck you will want to check the trailer's connector for corrosion and clean as necessary and then trace the circuit to your interior lights fixing any obvious signs of a short. Also, make sure the assemblies are grounded to a clean metal surface.
Ajm
6/16/2020
I have a 2005 Chevy Silverado and just bought a 2 horse bumper pull. I previously towed a goose neck with the 7 way plug. When I hooked to the 2 horse trailer up, all running lights and break lights work but the inside trailer and tack room lights do not work. What can I do to get these to work?
Mark L.
5/27/2020
So, I am having the same problem. (2017 Ford f150) All Exterior lights were fine, the switched interior lights are not working. One interesting piece is that While doing some maintenance on the trailer, I pulled the battery for the E-brake system. (I knew it was older) and when I disconnected the battery the interior lights would work. I assumed a bad battery so I replaced it. The old battery disconnected only read .37 volts. The new battery before installing read 12.47 volts. After reconnecting the new battery, interior lights will NOT work again ???????? (Trailer was not physically hooked to truck, just 7-pin wire plug was plugged into truck)
Rubydmills@gmail.com
2/25/2020
Where is the 40 amp fuse located under the hood that runs your interior horse trailer lights. Im having same problem with my 2008 dodge 3500 ram mega cab dully hitched to my trailer. All other lights work :
Products Referenced in This Question
Product Page this Question was Asked From
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 4 Flat
- Tekonsha
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