Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2009 GMC Topkick
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2009 GMC Topkick
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Wiring a trailer doesn’t have to mean cutting into your factory wires. The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs straight into the existing connector behind the tail light housing. It’s a true plug-and-play setup, so you skip the guesswork and keep your vehicle’s wiring intact.
Some vehicles need their lighting signals combined for trailer use. This harness has an integrated converter that handles that job, keeping the trailer’s running, turn, and brake lights working in sync with your vehicle. It ensures proper lighting every time you hook up and helps prevent signal mix-ups.
Finding where to plug in can be tricky, but this harness connects right where you need it—behind the driver-side tail light housing through a small access panel. Once located, it snaps in securely and routes neatly out of sight for a clean install with no dangling wires.
The 4-flat connector provides running light, turn signal, and brake signal functions for your trailer. It’s the standard connection for most light-duty towing setups like utility trailers, campers, or boat trailers, so you’re ready to go as soon as it’s plugged in.
If your lights ever stop working, you can test the wiring into and out of the converter with a simple circuit tester. That makes it quick to isolate whether the issue is in the trailer or the harness—keeping maintenance straightforward and frustration low.
Ratings & Reviews
Easy plug and play installation and does exactly what it supposed to. Nice product
Well this install on my '05 Outback Wagon was more challenging than the last one I did on my '05 Baja but all's well that ends well. Haven't done the wiring yet because the hardware install took all day but confidence is high. These guys make a quality product!
I ordered a trailer wiring system for my 1996 Subaru and it came very quickly, and plugged right into the receptacle. I was happy with the service and product. I would order from e-trailer again.
Was exactly as advertised and was easily installed especially after watching the video installation guide provided
Great product at a reasonable price! Would order from this vendor again. Enclosed instructions were great! 5 stars.
it was fine except instruction said for my access for the plug in had a 3 x3 door which there wasn`t on my 06 I had to take off inside panel to get it.
etrailer helped me identify my trailer wiring harness perfectly. Set up took about 20 minutes. My order was handled professionally and shipped quickly--a five star experience!
EASY Install. I watched a video under installation instructions and completed the task in under 10min.
A snap to installQuick and easy- ONCE you find the wiring harness plug. My Forester had the plug hidden behind a flap directly under the passenger side taillamp, not in front of the spare on the passenger side as shown in the photo.
ordered on saturday and received on tuesday. heavy duty and only took 10 minutes to hook up. This was not the first time I have ordered from etrailer. Have been pleased with product and service on all my orders.
Outstanding!!
Fastest shipping I have ever seen! (and inexpensive also)
Saved me hours of work and at least a hundred dollars!
Would recommend for any trailer hitch needs.
Outstanding in every way.
Thank you.
These hitches and electrical systems work awesome for older Subarus. We are fly fishing guides and the hitch pulls a drift boat and raft easily.
The connector arrived in just a couple of days. Exact replacement of the one that had gotten wet (in the spare tire well). I expect installation to be simple and my trailer lights will be working again.
We chose etailer.com mainly because of the GREAT installation videos they provide, for LOTS of vehicles. This time we just got a trailer electrical hookup, which was easy to attach - we'll definitely go back for more more major items. Service and delivery are great.
I replaced a dead tail light connector on my 2005 Subaru Outback Wagon. A local car shop did the wiring several years ago, and when getting the boat ready this season, I finally figured out that the tail light connector had died. Wish I had known about this Subaru-specific plug-n-play option when I had the original hitch wiring installed. Insanely easy to install/replace. I just followed the instructions someone posted here to find the connector in the cargo area. I had no idea it existed, and I'll bet the people who installed the hitch/wiring didn't either. Once you have the plug int he cargo area, you can finish in just a few minutes.
I'm going to run the wiring down to my already-existing connector mounted by the hitch receiver and connect there to make everything clean, but you don't need to, and can be up and running in a few minutes.
I have ordered 5-6 trailer hitches from etrailer over the past few years. Delivery has always been fast with excellent packaging.
This order was no different. In the past, the hitches installed with very little difficulty.
I this case, I was not able to install before my daughter left for work as a hotshot in Colorado. But I have not doubt that in six months, when she returns, it will install as effortlessly as the ones in the past.
Thanks for your quality of products and very helpful staff.
I have purchased this product before but it went out unexpectedly past the warranty date; so I am forced to purchase again. This time there is a battery fuse compartment included with the unit.
Purchased this product along with a bolt on receiver hitch for my subaru forester. The wiring harness plugged right in, super easy install. I was actually surprised, it had correct plugs, operated perfectly, and has lasted with use. It also is easily stowed away, I just put it in the spare wheel compartment. Couldn't have asked for a better product. I plug my four pin trailer light connector in and it works every time.
This product is advertised for fitting a Subura sedan 2000. However when I received it I had to due massive modifications in order for it to work. I called the help line and the person on the other side was absolutely NO help and I am pretty sure he has never wired trailer lights in his life!!
Mike L.
8/2/2018
This wiring harness is indeed a fit for a 2000 Outback factory tow package-equipped models only. To determine if the vehicle is equipped with the tow package, look in the access panel behind the drivers side taillight. There should be a connector present. If the connector is not present, this particular harness will not work.
Quick shipment, right part! I'm very happy with my purchase. I've been wanting to tow a small trailer with my Outback, but because I couldn't connect lights, all the hitch ever was used for was to hold a bike rack. Then I purchased this very easy to install OEM-style trailer light harness, and I'm ready to tow!
Robert
5/9/2022
After a year, the wiring harness is still working perfectly. It was a good purchase!
One of the beat online buying experiencess yet...quick. shipping, good feedback, product was exactly as described and I installed it without a "hitch". Thanks etrailer!
Mice ate my trailer wires and I didn't check for shorts before connecting the wire harness, which shorted out. I had gotten it from a Subaru dealer and it was supposedly "genuine Subaru parts" with the logo and all. I cut it open and guess what? The circuit board says "Hopkins". Why pay big bucks at the dealer? You won't do better than getting the same thing for less than 1/2 at etrailer.com!
Fit great and easy install !
I have a Subaru Impreza Wagon 2.5i 2007.
You can easily access to the plug without removing the back light cover part. To see the plug, remove the small styrofoam storage part on the helper side. (not removed on pictures) . The wiring harness module box can be inserted into the molded styrofoam part without drilling anything. The trailer wiring can also be stored under this small storage door.
Trailer Wiring Connector for a 2009 Subaru Outback1. Required tools:
a. Phillips head screwdriver
b. Flat head screwdriver
c. Needle-nosed pliers
d. Knife
e. Small prybar
2. Remove the left side storage panel door, exposing the auxiliary equipment plug and storage compartment.
3. Remove the spare tire floor hatch.
4. Remove the foam storage tray covering the spare tire.
5. Remove the left floor panel by pulling up with a handhold near the tailgate and another between the two white plastic squares. The floor panel is held in place by two hidden bayonet pin clips that protrude into two white plastic squares.
6. Remove the left foam floor panel by pulling out a single pin clip in the non-foam area near the tailgate and pulling out the white plastic squares, which have bayonet pin clips on their bottoms.
7. Search the small crack between the floor and the interior side panel for the wiring harness. The wire may appear as a loop with a pink tape.
8. The connector is taped to the main harness wire just below a wire clip. Pull on the loop until you stretch the blue tape and release the connector. The crack is too narrow to insert your fingers and there is no access from above. Try pulling on the loop using the end of a screw driver. Pull toward the front of the car. If you feel uneasy about applying too much force, then use the following steps.
a. Pry off the small plastic cover in the center of the rear left cargo ring, exposing a Phillips head screw.
b. Remove the cargo ring screw. Pull on the cargo ring, it should pop out.
c. Using a small prybar pull the interior panel out enough to get a slant view of the connector which should be located just to the right of the cargo ring mounting bracket.
d. Cut the blue tape and pull the connector loop out through the crack at the bottom of the interior side panel. If you cannot cut the tape then you must partially remove the interior side panel.
e. Pry up the left end of the liftgate threshold. It is held in place by two hidden bayonet pin clips about 2 and 4 inches from the left end.
f. Temporarily block up the end of the threshold with a wedge.
g. Using the prybar and screwdriver, pull back the edge of the interior side panel enough to expose the connector. Wedge the side panel open.
h. Reach in with the knife and cut the blue tape. You may have to duct tape the knife to a stick to reach the connector. Pull the connector loop out through the crack at the bottom of the interior side panel.
i. Refit the interior side panel and threshold. The hard part is over.
9. Apply a small amount of electrical grease to the male end of the connector to help prevent corrosion and push the connector ends together.
10. If not attached, grease and attach the trailer plug and wiring harness to the converter box.
11. Mount the converter box using the supplied double-sided tape, screw or zip-ties.
12. Route the wiring harness along the crack to the back of the vehicle.
13. Check the harness by plugging into a properly wired trailer. Test all functions with the engine running.
14. Replace the foam floor panel, the left floor panel and the left side storage panel door.
15. Replace the foam storage tray covering the spare tire and the spare tire floor hatch.
I looked for the connector in the area the instructions had specified but could not find it. So I started taking off both tail light covers and cubby hole covers. Pulled the spare tire cover and all the foam covers. I just about gave up when I saw some blue tape. I remembered the instructions saying something about blue tape. So I started digging around under the right (passenger) side at the bottom edge of the right side trim panel. It was buried quite a ways in there. It actually didn't have a cover and was not taped to the harness. It was just a short pigtail with connector. It matched the connector of the 33855 harness.
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David H.
11/4/2015
I havent had any problems and I like the new in line fuse holder which protects my vehicle wiring