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Volkswagen Atlas (2021–Present) Flat-4 Wiring Installation

Vehicle Coverage: 2021–Present Volkswagen Atlas
Output: Powered 4-way flat trailer-light connector
Connector Location: Stored inside the cargo area when not in use
Connections: Exact-fit plugs connect behind both rear taillight circuits without cutting the factory lamp wires
Power: Dedicated fuse-protected battery connection
Connector Location: The completed flat-4 remains inside the cargo area and is routed through the hatch opening only while towing.
1. Opening the Rear Interior
The cargo floor coverings, spare-tire retainer, threshold trim, and the necessary side-panel fasteners are removed so both taillight connections can be reached without forcing the panels.
2. Installing the Driver-Side Connections and Module
The exact-fit connector is inserted inline at the driver-side lamp circuit. The powered converter is grounded and mounted on a protected flat surface behind the cargo trim.
3. Crossing to the Passenger Side
The green lead is routed behind the rear threshold and into the passenger-side access area, then connected inline without cutting the vehicle’s original lamp wiring.
4. Supplying Fuse-Protected Battery Power
A dedicated power lead is routed along a protected path to the engine-compartment battery connection. It is supported away from heat, sharp edges, suspension movement, and service points before the fuse is installed.
5. Testing and Final Storage
Running lights, brake lights, turn signals, and ground integrity are verified at the connector. The cargo trim is restored and the flat-4 is placed near the center of the hatch for clean inside storage.
Protected Indoor Storage. The connector stays out of rain, road salt, and exhaust heat when it is not connected to a trailer.