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GMC Savana (2017–Present) Flat-4 Wiring Installation

Vehicle Coverage: 2017–Present GMC Savana 2500 and 3500 vans without the applicable factory trailer connector
Output: Exterior 4-way flat trailer-light connector
Connector Location: Mounted outside near the receiver
Connections: Exact-fit plugs connect behind both rear lamp circuits without cutting factory wires
Interior Access: Passenger-van trim requires more disassembly than cargo-van trim
Connector Location: The completed flat-4 is mounted outside near the hitch and protected by a dust cover.
1. Opening the Rear Lamp Access Areas
Rear threshold and side trim are removed as required by the van’s cargo or passenger configuration. Passenger vans require additional care and time because more finished interior panels cover the lamp harnesses.
2. Connecting the Driver-Side Lamp Circuit
The factory taillight connector is separated and the exact-fit harness is installed inline without cutting or tapping the original vehicle wiring.
3. Routing to the Passenger Side
The crossing lead is carried beneath the threshold or above the rear cargo doors, depending on the interior configuration. It is secured clear of door hardware, cargo contact, and sharp body edges before the passenger-side connection is made.
4. Grounding and Exterior Routing
The harness ground is secured to suitable clean vehicle metal. The flat-4 lead is routed through a protected rear path to the hitch and supported away from the exhaust and spare-tire system.
5. Testing and Trim Restoration
Running lights, brake lights, both turn signals, and ground integrity are tested before the rear interior is reassembled. The exterior connector is mounted near the receiver and covered when not in use.
Cargo and Passenger Vans Are Not the Same Job. Passenger-van trim increases access time, while both versions receive the same clean exterior flat-4 location.