Trailer Wiring Installation Tips

By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights. This is accomplished by tapping into the tow vehicle's electrical harness to transfer power to the trailer wiring system. Connectors are used between the two to allow disengagement when not towing.

Trailer Connectors

Various styles of connectors are available with four to seven pins to allow transfer of power for the lighting as well as auxiliary functions such as electric trailer brake control, backup lights etc. Choose a connector that has the required number of pins for the functions required.

The male end is mounted on the vehicle side and the female on the trailer side.

4 Way Trailer Connectors

Flat, molded connectors are available allowing the basic hookup of the three lighting functions and ground. Round 1-1/4" knock-out style can be permanently mounted directly onto all Hidden Hitch products or onto a separate plug mounting bracket. This provides a clean installation and avoids the potential problems associated with leaving a plug dangling from the rear of the towing vehicle.

6 Way Trailer Connectors

Round 1-1/4" diameter metal connectors are available that allow 1 or 2 additional functions such as back up lights and electric brakes. These can be mounted on all Hidden Hitch products.

6 Way Trailer Connector

7 Way Trailer Connectors

Additional pins for auxiliary power, trailer battery charging etc. are available using larger 2" diameter, round connectors. Typically these are needed for larger trailers and can be mounted directly in the bracket mounted on every Class III and IV Hidden Hitch.

7 Way Trailer Connector

Trailer Wiring Diagram

trailer wiring diagram

Popular Trailer Wiring Connectors and Components

Part #: 118015 7-Way Car End Replacement Socket - OEM - 118015
Tow Ready 7-Way U.S. Factory Car Replacement Socket is designed is designed for 7-Way OEM Buick, Ford, GM & Nissan and SAAB Vehicles.
Your Price
$15.89
List Price
$21.18
You Save
$5.29
Part #: 118311 T-One Connector - 118311
T-One connector 118311 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$13.41
List Price
$13.88
You Save
$0.47
Part #: 118317 T-One Connector - 118317
T-One connector 118317 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$21.89
List Price
$27.86
You Save
$5.97
Part #: 118353 T-One Connector with Converter - 118353
T-One connector 118353 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$29.54
List Price
$37.18
You Save
$7.64
Part #: 118354 T-One Connector with Converter - 118354
T-One connector 118354 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$27.71
List Price
$32.52
You Save
$4.81
Part #: 118376 T-One Connector with Converter - 118376
T-One connector 118376 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$26.71
List Price
$32.52
You Save
$5.81
Part #: 118384 T-One Connector - 118384
 
5.0
T-One connector 118384 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
Your Price
$28.54
List Price
$37.18
You Save
$8.64
Part #: 20117 7 Way LED Tester - 20117
Tow Ready 7 Way LED Tester 20117 tests turn signals, brake lights and gound with ease.
Your Price
$13.95
List Price
$16.74
You Save
$2.79
Part #: 20212 7-Way Mountng Bracket for U.S. Car Connectors - 20212
Tow Ready Mounting Bracket for 7-Way U.S. Car Connectors. Includes 2 self-tapping screws, bolts and nuts.
Your Price
$4.72
List Price
$5.97
You Save
$1.25
Part #: 421128 7-Way Junction Box - 421128
This junction box is ideal for professional trailer wiring jobs.
Your Price
$19.66
List Price
$27.47
You Save
$7.81

Customers Shopping for Trailer Wiring Products Also Viewed: