2024-2025 GMC Sierra HD AT4X AEV Reverse Lamp Wiring Harness
The 2024-2025 GMC Sierra HD AT4X AEV Reverse Lamp Wiring Harness is a plug-and-play wiring solution built specifically for the T1 Gen (2019–2024) GMC Sierra HD. No cutting, splicing, or professional installation required — simply connect to your existing factory harness connectors and go.
This harness is used for adding the Baja Designs 3" cube lights into your rear bumper on your AEV.
This harness is a relay style harness.
A relay style is needed as the reverse system, does not support the extra load on the circuit.
Comes with the correct connector for the baja squadron lights.
If you are using a different style light, you can simply remove those connectors from our harness.
Here is a link to the AEV site for the lamps and brackets.
Fits 24-26 HD models INSTALL: Harness will plug inline at either taillight to body harness.
This connection is located at the rear frame rail at either side of the truck.
Disconnect that connector and install the PnP portion into it and connect back together.
At that point you can mount the relay.
The relay does not need to be grounded, we just recommend that you install it where it won't get constant exposure to water or salt.
Once that is done you will install the Posi-Loc.
At the backside of the trailer connector, you will see a group of 7 wires.
The white wire is the largest and the second wire is usually red/green stripe or orange.
This is the wire you will want to install the posi-loc onto to.
Unscrew the cap, opposite the wire side and install the cap over the power wire, then screw the housing onto the cap.
Once you have verified that everything is working you can wrap that posi-loc in electrical tape or apply some silicon sealer to it.
We have found on some 25 models that there is a black wire and that is actually the power wire, not all models but some.
- You will not need to purchase the harness from them.
Please verify your specific model year and trim before ordering. Some harnesses are built to order — review all options carefully.
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