Maybe its wired for the China trailer market but in the USA we have a wiring code we use. All the colors are there but they don't match the plug end. The only correct wire was the ground wire.
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Pros
I liked it my trailer lights and brakes work now itβs a 7 wire but it will work for a 5 wire
Cons
The colors on wires don't match up with trailer colors. Double check when connecting.