Troubleshooting New 7-Way on Truck that Only Worked with One Trailer
Question:
Installed a new 7 blade truck connection on a F450. 1st trailer I hooked to worked perfectly. The next 2 I tried did not show any connection and nothing worked. Switched vehicles and all trailers are fine so it’s something in the new plug. Will troubleshoot tomorrow. Ground issue on the truck maybe? Plugs seem to seat fully.
asked by: Dave
Expert Reply:
It most likely is a ground issue on the new connector, but that fact that it works with one trailer but not the rest makes that harder to pin down. Make sure you didn't blow any fuses trying the second trailer too as that's a possible issue.
If you test all the pins on the 7-way for voltage do you get the correct voltage in the right places? Use the video and picture I attached as a guide for this.
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Article: Trailer Wiring Diagrams
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Brake Controller Installation: Starting from Scratch
- Article: Testing Trailer Brake Magnets for Proper Function
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: Troubleshooting Brake Controller Installations
- 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: Trailer Turn Signals Both Blink when Just Left Turn Signal is Activated
- Q&A: Trailer Lights Left Side Turn Signal and Brake Lights Not Working
- Q&A: Troubleshooting No Running Lights on Trailer but Turn Signals and Brake Lights Work
- Q&A: Parts Needed to Flat Tow 2023 Jeep Gladiator
- Q&A: Can the Curt Custom Tail Light Wiring Kit Be Used With LED Lights
- Article: Trailer Lighting Requirements