Correct Pin Out for Truck and Trailer 7-Way Blade Connectors
Question:
Which manufactures use trailer brakes wiring with a 7 blade flat light connector. One style is power for brakes on a outside blade and the other style center pin is brakes, always have this issue. When I rent a chipper it’s always a problem cause my truck locks the brakes, so which style is more widely used, so I have less problems and it’s not just the wire colors cause when I go to buy a 7way to 6 way there are two different wiring ions
asked by: Ben
Expert Reply:
Attached are some photos of the typical wiring functions for truck and trailer 7-Way blade connectors, like parts # PK11893 and # PK12706. If you typical pull a trailer that has a 7-Way connector then you want to follow the pin out diagrams I mentioned. If the chippers that you tow have a different configuration then the Hopkins Adapter # HM47535 will likely do the trick because you can change it so that the center pin is either related to the electric brakes or the 12V power.
If you are talking about different connections please let me know and I'd be happy to help you out! You are correct that the color wiring isn't the best way to try to wire connectors as those colors can vary per function.
You W.
3/10/2020
I cant get a 2015 Chev pickup to light up a trailer that works on older trucks. They turned the plug upside down.
Products Referenced in This Question
Hopkins Adapter 7-Pole to 6-Pole Universal with LED Tester - Electric Brake Center Pin
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 7 Round - Blade
- Plug Only
- 6 Round
- Hopkins
more information >
Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- Plug Only
- 7 Round - Blade
- Pollak
more information >
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
more information >
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Eric W.
8/2/2020
I have a flat car hauler with 7 pin connector. Trailer brakes work and truck says they are connected (integrated brake controller). Truck also says trailer is not connected I think because lights do not work. I think it's bad ground through the hitch. Can I splice into the white ground wire that goes to the brakes and ground that to the frame up near the hitch ?