7 Pin Commercial Trailer Wiring Diagram. The blue wire is usually the electric brake wire that hooks up to your electric brake controller inside of the cab. It should be noted that the center terminal is labeled as an auxiliary circuit but is most.
On alot of the trailer plug kits, they have pics and diagrams in the package.
I am trying to determine which pins are necessary for backup lights to come on when the vehicle is put into reverse.
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The diagram below shows the view from outside the vehicle socket (under the flap) and from inside the trailer or caravan.. I found a diagram on the web (see attached), but can't tell if the diagram is from the front or rear of the connector - ie if you unplugged it at looked at the side that mates with. Refer to your trailer service manual and plug installation instructions to avoid wiring problems that may damage your trailer, brake controller or vehicle!