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For the future you can just google/internet search just about anything including the 4, 5, 6, 7 wire plug wiring male and female, also all trouble codes what they mean and possible solutions.
No waiting for responses, what we refer to DIY searching for solutions on the internet.
 

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What M.A.M. posted and what I posted is the way these 4, 5, 6, 7, pins have been wired since the 60's, that I know of anyway.
Like PHAT RAT said standard in the industry unless someone else had a different idea on their own trailer.
Nothing to be confused about as long as you understand basic color code wiring.
 

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I just went to this thread, got as far as the picture,and printed it. Then scrolled down, and saw the search. Almost got worried, then seen round,spade several types wired differently. I’m 70 and have a box of different connectors, so I see where the original poster could be confused. I am new to the diesel world but not to power/electrical systems. Being old I have learned.
You have to remember when your looking at the plug the wire location is the opposite when looking at the plug and the wire location on the back side.
The center has always been for reverse/backup lights on a 7 wire plug.
I have to think about it every time I'm connecting wires, the trailer male plug terminals is the opposite location of the female vehicles plug.

If you had a 7 wire plug that the center was for charging then someone changed the location, that's not the standard.
7 wire plugs are blades that's all I've ever seen, with the center (backup lights) is round, the 6 wire plugs are round and the center is black for 12 volt.
 

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I'll refrase that, 7 pin with blades is all that I've seen and worked with.
I did come across these during this discussion, but I think they are not easy to come by anymore.
I'm pretty sure you won't find 7 pin round on any vehicles as standard trailer wiring on vehicles from the factory these days.
 

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Yes, you are correct, I drove trucks for 40 years and just had a flash back after clicking on your link, my bad.
I’ve been retired for 9 years so now my focused his only been on personal vehicles.
 
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