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Customer Reviews

Wiring a 7 Blade Trailer Harness or Plug

Written by hitchweb Team
Tuesday, September 6, 2011 — 4 Comments

Have you ever asked yourself what is the center connector on a 7 blade plug? The purpose of each blade will vary between a trailer end plug and a car end plug, they will both have a blade for tail/marker, charge, right turn, brake, ground and left turn.

The center connector on a 7 blade plug is for auxiliary in case you want to keep the fridge going while on the road - it’s always nice to arrive to your destination knowing you have a cold drink waiting for you!

Here’s an illustration which may help guide you through the wiring process for a 7 blade trailer harness:

Wiring a 7 blade plug

Hope you found this helpful! Feel free to add a comment to this post if you have any questions or advice you’d like to share with others.

Posted in Towing 101


Hitchweb Team
Monday, October 16, 2017
If you are looking at the inside of the trailer connector where the wires mount to the terminals starting at the notch at the top and working clockwise: 1:00 is Black and 12 volt power 3:00 is Green and Right Turn and Brake 5:00 is Blue and Brake Controller 7:00 is White and Ground 9:00 is Yellow and Left Turn and Brake 11:00 is Brown and Tail and Running Lights Center is Purple and is Optional Reverse
Monday, October 16, 2017
Hello I'm having a hard time figuring the wiring on my trailer it's a l1-1014-w, and when they disconnected the connector it got yanked it and now I have to write it back up could you help me out with a diagram for a 7 blade connector? I'd really appreciate the help.
hitchweb team
Wednesday, May 14, 2014

Hi Ken, On a 7-way trailer plug the ground will always be the white wire, and the brake will be the blue wire.

Wednesday, May 14, 2014

how can I make sure on the trailer plug, which is ground and which is the brake? Take their word for it?

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