16 Ga., Primary Wire,Low Voltage,DC Trailer Cable
Brand

KMCable

Color

Black, Blue, Brown, Dark Blue, Gray, Green, Orange, Purple, Red, white, Yellow

Conductor

copper

Core

Single Core

sheath

PVC

Nominal voltage U0/U

60V

Temperature (°C) - flexing

100ºC/120ºC

standard

DC

MOQ

300M/Roll

24V 7P,ABS connector,Trailer Coil cable
Brand

KMCable

Core

7 Core

Conductor

copper

Operating Temperature

-20℃~+80℃

Nominal voltage U0/U

24V

Connector Material

TPU

Color

Black

standard

US

MOQ

1pc

$240.00
24V N-Type,7P ABS connector,Trailer truck Coil cable
Brand

KMCable

Conductor

copper

Connector Material

TPU

Core

7 Core

Color

Black

Nominal voltage U0/U

24V

Type

Euro Standard

Operating Temperature

-20℃~+80℃

MOQ

1pc

$120.00
7 Core 24V,Corrosion Resistant,Power Coiled,Trailer Cable
Conductor

copper

Connector material

TPU

Color

Black

Core

7 Core

Operating Temperature

-20℃~+80℃

Voltage

20V

Nominal voltage U0/U

24V

Type

Euro Standard

MOQ

1pc

$120.00
7 core Automotive wire,Bright Green Jacket,Trailer truck Cable
Brand

KMCable

Color

Green

Conductor

copper

Core

7 Core

Nominal voltage U0/U

60V

Temperature (°C) - flexing

-40℃~+70℃

MOQ

300M/Roll

7 Way Coiled Cable,Power Spiral cable,Heavy Duty Trailer Wire
Brand

KMCable

Conductor

copper

Core

7 Core

Color

Black, Blue, Green

Connector

7P N-type*2

Nominal voltage U0/U

24V

Standard

US

MOQ

OEM Products need to contact our bussiness manager

7P Plugs Coiled Trailer cable,TP1201,Black Jacket,Spiral wire
Brand

KMCable

Color

Black

Conductor

copper

Core

7 Core

Nominal voltage U0/U

12V

Temperature (°C) - flexing

-40°C ~100°C

MOQ

300M/Roll

7P Trailer Wiring Harness,Heavy Duty Trailer Truck Cable
Brand

KMCable

Conductor

copper

Core

7 Core

Color

Black

Connector

7way American trailer plug

Nominal voltage U0/U

24V

Standard

UL

MOQ

OEM Products need to contact our bussiness manager

Aluminum plugs Trailer Cable,12V SAE J560,Coiled Trailer Wire
Brand

KMCable

Color

Black

Conductor

copper

Core

Multi

Nominal voltage U0/U

customized

Temperature (°C) - flexing

-40°C ~100°C

MOQ

3PC.

Automotive wire,Dark Blue Jacket,7 core Trailer truck Cable
Brand

KMCable

Color

Dark Blue

Conductor

copper

Core

7 Core

Nominal voltage U0/U

600V

Temperature (°C) - flexing

-65°C to 79°C

MOQ

300M/Roll

Battery Cable,Black/Red,Copper,single core cable
Brand

KMCable

Conductor

copper

Core

Single Core

sheath

PVC

Color

Black, Red

Nominal voltage U0/U

1000V

Temperature (°C) - flexing

-40°C to 66°C

MOQ

300M/Roll

Bulk Booster Cable,Orange&Black Jacket,trailer truck cable
Brand

KMCable

Core

2 Core

Color

Black, Orange

Conductor

copper

Nominal voltage U0/U

60V

Temperature (°C) - flexing

-30°C to +80°C

MOQ

300M/Roll

Bulk Booster Cable,Yellow/Black,Copper Trailer cable
Brand

KMCable

Color

Black, Yellow

Conductor

copper

Core

2 Core

Nominal voltage U0/U

50V max

Temperature (°C) - flexing

-40 C to +60 C(40 F to +140 F )

MOQ

300M/Roll

Detecting Battery Cable,Single core,trailer truck cable
Brand

KMCable

Color

Black, Red, Transparent

Conductor

copper

Core

Single Core

Nominal voltage U0/U

60V

Temperature (°C) - flexing

-30°C to +80°C

MOQ

300M/Roll

Green Trailer Coil cable,12V 7P ABS connector,Trailer truck Spiral wire
Brand

KMCable

Color

Green

Conductor

copper

Core

7 Core

Nominal voltage U0/U

12V

Temperature (°C) - flexing

-40°C ~100°C

MOQ

300M/Roll

Heavy Duty trailer cable,Trailer Coiled,Power Cable, 7PIN
Brand

KMCable

Conductor

copper

Core

7 Core

Color

Black, Blue, Green

Connector

7P N-type*2

Nominal voltage U0/U

24V

Standard

UL

MOQ

OEM Products need to contact our bussiness manager

Metal connector,Coil cable,7P,Trailer truck,Spiral wire
Brand

KMCable

Conductor

copper

Core

7 Core

Operating Temperature

-55°F~+190°F

standard

US

Connector Material

Metal

Color

Black

Nominal voltage U0/U

24V

MOQ

1pc

$160.00
Single Core welding cable,16 mm Pure copper wire,Trailer Cable
Brand

KMCable

Color

Black

Conductor

copper

Core

Single Core

Nominal voltage U0/U

600V

Temperature (°C) - flexing

-50°C to 70°C

MOQ

300M/Roll

Spiral Coiled wire,7-13S ABS connector Plugs,TP1202,Trailer cable
Brand

KMCable

Core

7 Core

Color

Black

Conductor

copper

Nominal voltage U0/U

12V

Temperature (°C) - flexing

-40°C ~100°C

MOQ

2PC.

TP1203 Trailer Coil cable,13S-7P ABS connector,Spiral wire
Brand

KMCable

Color

Black

Conductor

copper

Core

7 Core

Nominal voltage U0/U

12V

Temperature (°C) - flexing

-40°C ~100°C

MOQ

300M/Roll

Trailer Coiled cable,Trailer Truck Part,Power Cable, 7pin
Brand

KMCable

Conductor

copper

Core

7 Core

Color

Black, Blue, Green

Connector

7P N-type*2

Nominal voltage U0/U

24V

Standard

UL

MOQ

OEM Products need to contact our bussiness manager

Trailer Coiled,electrical Cable, 7 Core , Heavy Duty trailer cable
Brand

KMCable

Conductor

copper

Core

7 Core

Color

Black, Blue, Green

Connector

7P N-type*2

Nominal voltage U0/U

24V

Standard

US

MOQ

OEM Products need to contact our bussiness manager

Trailer truck cable & wire,Red/Black,Bulk Booster Cable
Brand

KMCable

Core

2 Core

Color

Black

Conductor

copper

Nominal voltage U0/U

60V

Temperature (°C) - flexing

-30°C to +80°C

MOQ

300M/Roll

Trailer truck Spiral wire,7P connector,Trailer,Coil cable
Brand

KMCable

Color

Black

Conductor

copper

Core

7 Core

Nominal voltage U0/U

12V

Temperature (°C) - flexing

-40°C ~100°C

MOQ

3PC.

Trailer truck wire,Bright Yellow Jacket,7 core trailer cable
Brand

KMCable

Color

Yellow

Conductor

copper

Core

7 Core

Nominal voltage U0/U

60V

Temperature (°C) - flexing

-40℃~+70℃

MOQ

300M/Roll

US standard,Coil cable,Trailer truck,Spiral wire
Brand

KMCable

Core

7 Core

Conductor

copper

Operating Temperature

-55°F~+190°F

standard

US

Nominal voltage U0/U

24V

Color

Black

MOQ

1pc

$100.00

Trailer Truck Cable

What is Trailer Cable

A trailer cable is a multi-pole electrical connector between a towing vehicle such as a car or truck and a trailer. It is intended primarily to supply automotive lighting on the trailer, but also provide management and supply to other consumers.

It is also referred to as “trailer wire,” “trailer connector,” or “trailer connecting cable.” Another feature the connector offers is feedback from the trailer to the towing vehicle, from being as simple as a fault indication for ABS brakes to advanced command, monitor and control using CAN bus for EBS brakes.

Type of trailer connector

According to more than 25 different international standards, trailer connector is used all kinds of vehicles. These range from agricultural machinery to cars and commercial vehicles to defense. Depending on area difference, there are different standard, such as Euro trailer connector, north America Standard trailer, Australian standard and etc. According to the pin number, there can be 4-pin, 7-pin, 6-pin, 5-pin, 12-pin, 13-pin.

There are several standards for trailer wires, and if you search, you’ll find a different Trailer Wiring Diagram for each.  Each standard has it’s different purpose, so please don’t just make it up as you go.  Don’t make a weird wired trailer.  Follow these guidelines and make it right!

The approach for you depends on your electrical needs.  To start, every trailer needs lights — brake lights, turn signals, and tail lights.  Some also need side markers and running lights.  Some brakes need electricity too — to actuate electric brakes, or to disable hydraulic brakes when backing up.

The following trailer wiring diagram(s) and explanations are a cross between an electrical schematic and wiring on a trailer.  We recommend these standards because they are pretty universal.  That said, for specific situations, there are industrial standards with different connectors and wire arrangements.  It can get confusing, so if you don’t already have a specific standard in mind, follow these.

Trailer Wires 4-Pin Connector

4-Pin Flat Connector

At a minimum, all trailers need at least 4 functions:  Tail lights, Brake lights, Left & Right signals.  4 wires will give these functions, so the simplest scheme is a 4-pin connector.

The most common 4 wire connector is the 4-Pin Flat Connector as shown here.  Trailers that use this are usually fairly light weight and don’t have brakes or other power accessories.  It’s the most common style for “consumer” type trailers.  Small utility trailers, light boat trailers, little campers, off-road trailers and many more use this traditional 4-Pin Flat connector.

Lighter Duty Trailer (No Brakes) = Use a 4-Pin Connector.

1.  White = Ground  (See White Wire Notes below.)
2.  Brown = Tail Lights, Side Markers and Running Lights  (See Brown Wire Notes below.)
3.  Yellow = Left Turn Signal & Left Brake Light
4.  Green = Right Turn Signal & Right Brake Light

Please see the Trailer Wiring Diagram and Connector Application Chart below.  The 4-Pin connector only has the first 4 items listed.  The rest you can ignore.

Trailer Wiring 5-Pin Connector

5-Pin Flat Connector

(Round style 5-Pin Connectors also exist.)

Trailers with capacity over 3000# Total Gross Trailer Weight should have brakes.  That’s not mandatory everywhere, but it’s a good idea.

If a trailer has brakes, then it needs a connector with at least 5 pins.  The 5th pin, a blue wire, gives power to operate (or disable) the trailer brakes.

Traditional Trailer + with Brakes = Use a 5-Pin Connector.

1-4  Wire the first 4 pins (White, Brown, Yellow, Green) just like the 4-pin connector above.
5.  Blue = Electric Brakes or Hydraulic Reverse Disable (See Blue Wire Notes below.)

In the Trailer Wiring Diagram and Connector Application Chart below, use the first 5 pins, and ignore the rest.

If your truck has a built-in 7-pin socket, but you only need 5 of the pins.  Use the 7-pin connector anyway (see below), and just leave out the last 2 wires.  It accomplishes the same thing for 5 wires, but with a connector that’s compatible with your truck.  The 5-Pin flat connector above is nice for easy handling, but if your vehicle already has a 7-pin, just use it.  It’s OK, within the standards, to leave out wires for your custom situation.

Trailer Wire Connectors - 7-Pin RV Style

7-Pin Connector

For trailers that have a little more going on electrically, we recommend 7-pin connectors.  The 2 added pins are typically for Auxiliary Power and Back-up Lights.

Expanded Use Trailer + with Brakes, Aux Power & Back-up Lights = 7-Pin Connector.  (6-Pin Connectors also exist, but they are less common.)

1-4  Wire the first 4 pins just like above, and the 5th line goes to the brakes.
5.  Blue = Electric Brakes or Hydraulic Reverse Disable (See Blue Wire Notes below.)
6.  Red (or Black) = 12V Auxiliary Power (See Red Wire Notes below.)
7.  Purple = Back-up Lights (Sometimes another color.)

7-Pin Connectors like the one pictured are very common for RV’s and other bigger-ish trailers.  This is the style we recommend.  Other styles exist — though the pin-outs are often different.  Several industrial styles are similar and definitely use different pins.

It is OK to leave a pin or two blank (unused and unconnected).  For instance, looking at the trailer wiring diagram, if you want Auxiliary Power, but don’t have back-up lights, then just leave the purple wire out.  A blank spot (unconnected pin) doesn’t hurt anything.

The Trailer Wiring Diagram and Connector Application Chart

Trailer Wire Color Codes  –  Colors Coordinate With Trailer Wiring Diagram
Connector Style Pin Function Color Description
7-Pin 6-Pin 5-Pin 4-Pin 1 Ground White Ground for all trailer electrical functions.
2 Tail Lamps
Running Lights
Side Markers
Brown Power for all normally ON lamps.
Tail, Running & Side marker lights.
3 Left Brake Light
Left Turn Signal
Yellow Multi-function signal for the
Left Side Rear Tail Lamp
4 Right Brake Light
Right Turn Signal
Green Multi-function signal for the
Right Side Rear Tail Lamp
5 Brake Blue Electric Brakes Control Power
or Hydraulic Brake Disengagement (5-Pin only)
6 Battery Red
(or Black)
Vehicle Power +12V
For trailer battery charging and accessories.
7 Back Up Purple Back Up Lamps on Trailer Tail Lights
/ Hydraulic Brake Disengagement

See below video about why tension and strength are important: