Trailer Wiring & Electrical Connection Installation – Manassas VA
Trailer Electrical Connection Installation – Manassas, VA
4-Pin, 7-Way, & Brake Controller Setup for Safe Towing
Before you hitch up your trailer, you need a reliable electrical connection between your towing vehicle and trailer. At American Truck & Trailer Supply in Manassas, Virginia, we install everything from basic 4-pin trailer plugs to 7-way RV connectors and trailer brake controllers—so you can tow legally, safely, and confidently.
Whether you’re towing a utility trailer, boat, camper, or enclosed hauler, we’ll make sure your electrical system is up to the task.
Types of Trailer Electrical Connections We Install
4-Pin Flat Trailer Connector
The most common wiring setup for light-duty trailers without brakes.
Supports:
Running lights
Brake lights
Left/right turn signals
Ground
Used for:
Utility trailers
Small cargo trailers
Jet ski, ATV, or lawn care trailers
7-Way Round RV Blade Connector
Required for trailers with electric brakes, this plug provides a full-power connection for all your trailer functions.
Supports:
All 4-pin functions
Trailer brake power
Auxiliary power (12V charge line)
Reverse lights (if installed on trailer)
Used for:
Travel trailers
Car haulers
Enclosed cargo trailers
Horse trailers & goosenecks
Toy haulers
We install OEM-style trailer connectors mounted to the rear bumper or hitch area, using weatherproof harnesses and junction boxes.
Do You Need a Trailer Brake Controller?
If your trailer has electric brakes, most states—including Virginia—require a working brake controller installed in the tow vehicle.
We install industry-trusted brands such as:
Tekonsha Prodigy series
CURT Echo & Spectrum
Redarc Tow-Pro Elite
Draw-Tite I-Command
Bluetooth-enabled
All brake controller installations are:
Professionally installed
Designed to work with 7-way connectors and electric-over-hydraulic setups
Additional Trailer Wiring Services
T-connector plug-and-play kits for late model trucks
Custom hardwired solutions for older vehicles
Adapter installation (7-way to 4-pin, and vice versa)
Breakaway switch wiring for trailers with brakes
Battery charge line integration
Fault diagnosis and wiring repairs
Compatible with All Vehicle Types
We wire trailers and towing systems for:
Ford F-150 / F-250 / Super Duty
Ram 1500–3500
Chevy Silverado / GMC Sierra
Toyota Tacoma / Tundra
Nissan Titan
SUVs and crossovers with towing packages
Commercial vehicles and fleets
Serving Manassas, VA and Northern Virginia
Conveniently located in Manassas, we proudly serve:
Gainesville
Bristow
Centreville
Haymarket
Warrenton
Nokesville
Fairfax
Sterling
Northern Virginia
Why Choose American Truck & Trailer Supply?
Full-Service Trailer Wiring Shop
4-Pin, 7-Way, and Brake Controller Specialists
Top Brands & OEM-Grade Wiring Components
Quick Turnaround & Professional Workmanship
Trusted by Northern Virginia’s Work Truck Owners & RVers
Get a Wiring Quote or Book an Install Today!
Towing a trailer? Don’t leave your electrical system to chance. Contact us today to get wired up the right way.
Location: 11949 Livingston Road, Manassas, Virginia
Phone: 703 257 1710