Question about 1993 Land Rover Defender

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I need a wiring diagram for a 7 pin trailer board plug

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  • Anonymous Mar 16, 2014

    need to install a 7 pin plug on a 6 wire trailer

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Here's one
I need a wiring diagram for a 7 pin trailer board  - 08-33-93f1.gif CAV CIRCUIT FUNCTION 1 Z13 12BK GROUND 2 B40 12LB TRAILER ELECTRIC BRAKE OUTPUT 3 L76 12BK/OR TAIL LIGHT (Trailer Tow Relay in PDC) 4 A6 12RD/TN* FUSED B(+) (40A, Always Hot, F8 in PDC) 5 L63 16DG/RD LEFT REAR TURN SIGNAL TRAILER TOW 6 L62 16BR/PK RIGHT REAR TURN SIGNAL CONNECTOR 7 L1 16VT/BK BACK-UP LAMP FIGURE 1: 7-Terminal Trailer Tow Connector

Posted on Jul 10, 2009

  • Patrick Razvoza Jul 10, 2009

    Link for 7 pin trailer adapter www.dodgeram.org/tech/mods/electric/trailer_wire.htm

  • ROBERTH34 Mar 27, 2011

    NEED WIRING DIAGRAM FOR 7 PIN TRAILOR BOARD PLUG

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When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

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The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

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I need a wiring diagram for a 7 wire system


I am guessing you mean the 7 pin trailer tow adapter.

the 7 pin RV plug itself

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If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.

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I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.

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I need to wire a 7 pin plug for my trailer hitch...do u have a diagram or instructions that i could have?


Hi jonas,

Click here for a diagrams showing color codes and wire placement in a half dozen vehicle types.

Click here for diagrams on standard trailer plugs.

The second link is excellent.

Remember: Good things come to those who Rate

Mike

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