Troubleshooting Trailer Brakes Not Working on One Truck But Working on Buddys Truck
Question:
Ford 250 horse trailer running lights all I have no brakes or brake lights or signal hook to buddys trailer slide tires and have lights hook to my old trailer to duddys truck have brakes hook back to my truck no brakes
asked by: William B
Expert Reply:
If the brakes and brake lights are not working when you plug your trailer into the 7-way on your 2005 Ford F-250 but they work when plugged into your buddy's truck it is likely the issue is the connector on your truck. Check your F-250's connectors for corrosion, which can be green or white in color.
A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you will need to either replace the plug with the Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket # PK11893 or clean the corrosion with some fine grit sandpaper or even something like a plastic knife. I also highly recommend using Dielectric Grease # LT37534 to help stop any future corrosion.
Products Referenced in This Question
Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube
- Accessories and Parts
- Wiring
- Dielectric Grease
- Loctite
more information >
Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket - Vehicle End
- Trailer Wiring
- Trailer Connectors
- Vehicle End Connector
- Plug Only
- 7 Round - Blade
- Pollak
more information >
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Q&A: Testing for Proper Voltage on the Brake Output Circuit
- Article: Trailer Wiring Diagrams
- Q&A: How to Make an Adapter to Go from Semi Truck 7-Way Round to RV Style 7-Way Blade on Trailer
- Q&A: Can Electric Brake Controller Install and Function in Semi Truck with Air Brakes
- Q&A: Replacement Circuit Board For Dometic Atwood Water Heater With Circuit Board 91346
- Q&A: No Power to 12 Volt on 7-Way of 2020 Ram 3500
- Article: Testing Trailer Brake Magnets for Proper Function
- Article: How to Accurately Measure Trailer Leaf Springs
- Q&A: What is Most Common Leaf Spring Length for 3,500 lb Trailer Axle
- Article: 5 Tell-Tale Signs It’s Time to Replace Your Trailer’s Leaf Springs
- Q&A: How to Tell if 2019 Toyota Highlander Has Factory Tow Package
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Troubleshooting Brake Controller Installations
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)