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Trailer Wiring Harness Installation - 2001 GMC Safari

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How to Install a Trailer Wiring Harness on a 2001 GMC Safari

Today on this 2001 GMC Safari we are going to be installing four pole harness part number 18002. We are in the rear cargo area of the Safari here and this particular vehicle has a factory installed tow package on it. The tow package is located over here on the passenger side of the vehicle inside the jack storage compartment. Remove the door and look under the jack, you can see there is a bundle of wires here. This is our tow package :25

We are going to pull it out and cut back the tape, you can see we have plenty of lead here because what you need to do is when you want to use the harness is pull it out the rear of the vehicle. We are going to cut back the tape to expose the wires. With the wires exposed you can see we have multiple wires here, enough for a full 7 pole harness. Since we are only installing a four pole we are only going to be needing the four primary colors, which are going to match up with the colors on my 4 pole here. :54

We have the white being the ground, brown being the running lights, green being the right turn and right brake, and yellow being the left turn and left brake. We are just going to wire those in color for color. The harness comes with standard quick splices, i prefer using butt connectors so I am going to use those instead. To use those I am going to strip back some of the jacketing on each one of the wires. Go ahead and one of the wires in the butt connector and crimp that down. Insert the corresponding wire from the 4 pole and slide it in the other end and crimp that down. That will make our connection for us. We just want to repeat that for all four wires. Then tape up your connection points. With our wires taped up, essentially our 4 pole is installed. 1:43

Again, I want to show you real quick how to route the wire out. You are going to need to close the rear doors and pull your harness out the top and close the hatch on it. You want to avoid the metal latch, but the weather stripping here will prevent it from being pinched so you do not have to worry about that. You can see I can still move it out freely. With that, that will conclude the installation of wiring harness part number 18002 on this 2001 GMC Safari.

Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Andrew K
Video Edited:
Andrew K

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