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Trailer Wiring Harness Installation - 2014 GMC Savanna Van

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How to Install a Trailer Wiring Harness on a 2014 GMC Savanna Van


Today on our 2014 GMC Savannah van we will be taking a look at, and installing the Tow Ready T1 Vehicle Wiring Harness for a four pull five Trailer connector, part number 118392. Here's what our wiring harness looks like once it is installed on the vehicle. Easy plug and play installation. You are going to have a four pull flat trailer connector, and a cover to keep out all of the dirt, grime and debris. This is going to offer your tail, your stop and your left and right turn signals. First thing we are going to need to do is open up the rear hatch or compartment of our vehicle. You are going to have your green side, that is going to be your passenger side, and your yellow and brown side with your ground wire, that will be the driver side.

Then your four pull flat trailer connector coming down below. We'll go ahead and start off by connecting our passenger side. We'll go ahead and find the connector which is going to have our safety, the orange safety on it and the blue tabs. We are going to need to remove the safety and then use a flat-blade screwdriver to press in the tab and release that bottom section. Just like so. Go ahead and come down back behind and make our connections to that with our T connector.

Click our factory bottom, and our factory top. Place in the orange safety, then we can run the wires back over the top and connect it to the existing wire loom. We'll bring our four pull back behind, and down, following those same wires, and once we get it through, we can find our driver's side factory connection, remove the tab, use a screwdriver to press it in, and separate it. Again connect the harness to the corresponding one and place in the safety. Now we will remove the ten millimeter bolt securing the ground for the factory and connect the ground for our T connector. Place in our ground and re-secure it.

Use our zip-ties provided in our kit to secure the wires and bring them down. We'll run them behind the panel so they don't get caught on anything that you might be loading. Secure up this one to the wiring harness here. Then I'll go back and cut off all the excess on the zip-ties. On the drivers side, directly behind the driver's side tire in that fender well, and right in front of the rear bumper you are going to find a square plug. If we remove that plug it is going to expose a compartment that goes up into the back of the vehicle.

Up on the inside of here, you may have a plastic plug with some insulation. If you go ahead and pull that down and out of the way, you will have enough room to get your four pull connector through and down and out this whole so you can run it to your trailer hitch receiver. We'll go ahead and use a piece of old air hose as a pull wire and push it up through there to where we can grab it from the inside. Now that we have it pulled up from the bottom we will go ahead and use a little bit of electrical tape to secure our four pull flag connector to that pull wire, we're going to pull that down and out of the whole. We're going to go ahead and set that off to the side with our receiver and put that plug back into the back end of the vehicle. Set it in and press in the push tab on the bottom. First thing we are going to do is connect our ground, we'll test the brown side of the first terminal to get our running lights, it'll be a solid signal. Then we'll test out the left turn signal which will be the yellow wire, and the green wire which will be that right turn signal, then brake light, which will be solid on both the yellow and the green. Our wires look good and check out, so we'll go ahead and put our cover over them and call it a day. That will do it for our review and installation of the Tow ready T1 Vehicle Wiring Harness for four pull five trailer connector, part number 118392 on our 2014 GMC Savannah van.


Questions and Comments about this Video

Gary

The inside plastic plug with insulation perplexed me... How did you pull it down...? My hand seems way to big to reach in there...

Etrailer Expert
Reply from Heather A.

You may have some insulation up there that you will be able to push away by using your hand. Then he uses a piece of air hose and fishes it through, tapes the wiring harness to it and uses it to pull it back through the compartment.

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