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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

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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.

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Jon G

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