Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Trailer wiring adapter that changes the 4 pole flat on your vehicle into a 5 pole flat.
The blue wire gets spliced into the reverse light wire on the vehicle which is easily done with the included quick splice wire connector.
Video of Adapter 4 Pole to 5 Pole Trailer Wiring Adapter
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today were going to show you a popular upgrade. We have here a four pole flat that has been installed on a vehicle. The owner has a boat trailer now and it has a five wire flat. So were going to convert that four wire to a five wire flat. We will show you how to deal with part number 20036 which is the adapter itself, and the bracket which is part number 20046. Our first step we need to do is take off the four pole and then well uninstall the bracket and put in the new bracket. It may take some force, but you have to pull to get this out of here. We actually used a rubber mallet to tap it a little bit, now this bracket can come off which we have previously loosened up. Now well install our new bracket and it will go in the same spot as before. What were going to do next is get our four pole ready which we have cleaned out with WD-40 and then were going to put in some dielectric grease. Well put that inside here and then were going to attach our four pole from our adapter inside there.
Now our five pole will get mounted to our adapter here. One thing I like to do when I have it connected since its semi-permanent is put a zip tie all the way around it so it will never come off. Now were going to install our five pole. Next were going to install our lead going to our reverse light. You see it comes in the kit with the other half and we put some dielectric grease in there. Now well install those together, then well wrap some electrical tape around it since this will be a semi-permanent connection also. What we have down here is zip tie our wire harness together to make it nice and as compact as possible, the next step is to find a place to hide it. If you can hide it behind the bumper if you have room, great. If not, since we do not have much room, were going to tuck it up underneath the bracket here and zip tie it. Our next step is to run the blue wire up to the reverse light. Now we need to take off our taillight so we can get to our reverse light wire. We have the back of the taillight exposed here, if you look at the front you can tell which one is your reverse light. Its pretty easy to find, in this case its on the top here and it has two wires. The black one will typically be the ground but double check with your vehicle. We also have a white wire which looks like its going to be positive. Well trace our connection down and run our connection right around here. We have some pretty close quarters running the wire through so what were going to do is take this simple wire here and use anything you want around the house just as long as you can manipulate it and keep it in a straight line.
Well run it down to the bottom and well tie it off to it and pull it back through. We have our wire through, and well just wrap our wire around the other wire. Now we can pull it back up through. Like we said earlier were going to attach to this reverse light lead right about here. Well use a quick splice which is a device that connects two wires together and comes with the kit. You simply just slide it on like so, then the other half of the wire is going to get pushed in along side of it. There is a stop on one side so what you want to do is make sure that the wire will go all the way through and go across the metal here. This is so the metal can do its job when you squeeze it with a pair of pliers it will make the connection and cut through the plastic. Give it a tug to make sure you have got it right. Now you snap your cover on and now were ready to reinstall our light and put our wire connector back in. Now we can reinstall. Well go ahead and give it the acid test and ground it here and well the check the reverse light lead on the outside here. Now well put it in reverse and try it and it looks like it works. To recap we used part numbers 20036, the four to five way adapter and 20046, the bracket itself.
Customers compare 20036 to these similar products
Customers Who Purchased This Wiring Also Bought...
Average Customer Rating: 



4.8 out of 5 stars (21 Customer Reviews)




by: Ted B.07/22/2011
Is this review helpful?
Exactly what I needed to get my boat trailer working right! Order process was painless and package delivered quickly. Thank you!19890




by: Dean W03/24/2011
Is this review helpful?
My etrailer experience has been great. Your site made it easy to find the part I needed and the video of how to install it was great. The product shipped and arrived ahead of schedule - I am very happy with my purchase.10268




by: Richard08/09/2007
Is this review helpful?
Overall -- satisfied Easy to install with a quick phone call to etrailer. I tapped into the one wire in the factory 6 pin connector that was not used with my 4 pole wiring harness. My only issue is that I would have liked the wire that taps in the reverse wire to be 1 foot longer, then it would be the exact lenght of the 4 pole wiring harness I used on my Odyssey347




by: Rob E06/28/2011
Is this review helpful?
Installation was a breeze & the video was very helpful. I went to 3 different places around town & they had nothing. Went to etrailer.com & found what I was looking for in 2 minutes. Will use them again in a heartbeat!18109




by: Captn Dave06/24/2011
Is this review helpful?
Exactly what I needed, and speedy fast delivery. Second time I've ordered from your website, and excellent both times. Dave17812




by: Keith05/30/2011
Is this review helpful?
Product works fine no complaint. 15719




by: Ben r05/27/2011
Is this review helpful?
Product arrived quickly, great email response / notifications. Great company.15543




by: tom n.05/17/2011
Is this review helpful?
The product I purchased was soooo much of a better product than I found locally-------- it workied perfect and the instruction sheet was also very helpful/14504




by: Tom S05/15/2011
Is this review helpful?
easy to install 14099




by: chris05/14/2011
Is this review helpful?
part quality was good though it'd be nice if it came with a cover/cap. Installation instructions were good. worked without a problem and was easy to do.13968




by: Robert P.01/28/2013
Is this review helpful?
Easy to use website, My order shipped the same day I received it four days later using normal ground delivery. Easy directions ,easy to install, will use etrailer again.64361




by: Toggle10/15/2012
Is this review helpful?
Product is good I suppose. Instructions say "Use blue wire tap (provided)" but give no clue where the wire is to hook to. Also I paid extra for UPS ground two day but it took a week. The main harness (this is just an adapter four pin to five pin) I got from Amazon. It arrived in two days and the instructions were clear, had photos and it was a piece of cake to install.57298




by: Mike B.09/17/2012
Is this review helpful?
Super easy installation! Only took 10 minutes and all parts necessary to complete are included!54863




by: 2003608/19/2012
Is this review helpful?
fast and easy to find what i wanted fit to a tee fast shipping I would buy from them again52301




by: Jay J.08/01/2012
Is this review helpful?
Does what its supposed to with little e ffort.50202




by: Mike05/23/2012
Is this review helpful?
Great products with best prices. 41467




by: DJ04/10/2012
Is this review helpful?
The 4 to 5 wire connector harness is exactly what I needed to covert my vehicle for towing surge brake trailers. It was easy to install and works great. Fast shipment and easy to use website. Good follow up and tracking updates. A+ buying experience. 36798




by: Straker03/05/2012
Is this review helpful?
All good. The main order was dispatched with so I could get on with the job, the rest of the order will follow. Good service and a good product range. The installation films on youtube are a bonus.33127




by: Stan02/13/2012
Is this review helpful?
Well made, easy to install, and the video was extremely helpful. As always, the service was terrific.31736




by: Jim02/08/2012
Is this review helpful?
Products are priced very well, Delivery was right away31357




by: Chris06/29/2011
Is this review helpful?
This was exactly what I needed. Our Nissan Pathfinder came with a 4 prong plug already installed, but our new boat trailer has a 5 prong plug. This fit perfectly, works great (already used it this past weekend) and the installation was easy, thanks in part to the instructional video included on the product page. Would definitely recommend to anyone that needs to go from a 4 prong to 5 prong for your trailer.18183
Ask the Experts about this Tow Ready Wiring

Related Products...
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.