What are the wire colors for a 4-pin flat trailer plug?

Ground is White, Left is Yellow, Markers are Brown, and Right is Green.

What is the pinout for a 7-blade round trailer connector?

Pin 1 (White) Ground, Pin 2 (Blue) Brake, Pin 3 (Green) Markers, Pin 4 (Black) Battery, Pin 5 (Red) Left, Pin 6 (Brown) Right, Pin 7 (Yellow) Reverse.

What wire color is the brake circuit on a 6-pin round trailer connector?

The brake circuit is Black on the 6-pin round connector; the diagram also shows Markers (Brown), Ground (White), Left (Yellow), Right (Green), and an Accessory pin.

From which side are the 6-pin and 7-blade round diagrams viewed?

Both diagrams are labeled 'Plug Back / Socket Front,' meaning the view shown is looking at the back of the plug or the front of the socket.

Which pin carries reverse light power on a 7-blade connector?

Pin 7, with a Yellow wire, is the Reverse circuit.

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Trailer Connector Wiring Color Codes: 4-Pin Flat, 6-Pin & 7-Blade Round Diagram

Trailer connector wiring diagrams for 4-pin flat, 6-pin and 7-blade plugs with wire colors

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Trailer connector wiring diagrams for 4-pin flat, 6-pin round and 7-blade plugs with color-coded pin assignments.

AI caption July 2011 · Photo 154 of 224

This document is a trailer wiring connector reference chart showing the wire color codes and pin functions for three common trailer connector types: the 4-Pin Flat Plug, the 6-Pin Round connector, and the 7-Blade Round connector. For the 4-pin flat plug, it shows Ground (White), Left (Yellow), Markers (Brown), and Right (Green), with plug and socket orientation illustrated. The 6-pin round diagram (viewed as plug back / socket front) identifies Markers (Brown), Ground (White), Left (Yellow), Accessory, Brake (Black), and Right (Green). The 7-blade round diagram (also plug back / socket front) numbers the pins 1 through 7 and assigns: 1 White = Ground, 2 Blue = Brake, 3 Green = Markers, 4 Black = Battery, 5 Red = Left, 6 Brown = Right, and 7 Yellow = Reverse. Each connector is drawn with pin positions, making the chart useful for wiring or troubleshooting trailer connectors on a tow vehicle such as the uploader's 1996 Ford Bronco, though the chart itself is a generic trailer wiring reference not tied to a specific vehicle or year.

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Frequently asked questions

What are the wire colors for a 4-pin flat trailer plug?: Ground is White, Left is Yellow, Markers are Brown, and Right is Green.
What is the pinout for a 7-blade round trailer connector?: Pin 1 (White) Ground, Pin 2 (Blue) Brake, Pin 3 (Green) Markers, Pin 4 (Black) Battery, Pin 5 (Red) Left, Pin 6 (Brown) Right, Pin 7 (Yellow) Reverse.
What wire color is the brake circuit on a 6-pin round trailer connector?: The brake circuit is Black on the 6-pin round connector; the diagram also shows Markers (Brown), Ground (White), Left (Yellow), Right (Green), and an Accessory pin.
From which side are the 6-pin and 7-blade round diagrams viewed?: Both diagrams are labeled 'Plug Back / Socket Front,' meaning the view shown is looking at the back of the plug or the front of the socket.
Which pin carries reverse light power on a 7-blade connector?: Pin 7, with a Yellow wire, is the Reverse circuit.