Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Rating: 
52 reviews
Code: A35W42B
Retail:$14.95
Price:$12.95
Shipping Weight: 1.2 pounds
Shipping Special
This is a 35' split wishbone 4-way trailer wiring harness with four conductors and a 42" ground wire.
Because the brake signal is sent along the same wire as each turn signal, the tail light signal is the only one that needs to be run along both sides of a trailer. The y-harness with 4-pole connector contains 2 separate tail light wires (brown wires), one bundled with the left turn and brake wire (yellow wire) and one bundled with the right turn and brake wire (green wire). It's the most efficient way to wire your trailer.
Manufacturer Cross Reference
Harness will work as an exact replacement for:
Truck Lite # 108835
Video of 35 ft. Wishbone 4-Way Trailer Wiring Harness with 42" Ground Wire
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today were going to be replacing the wiring on this trailer. We will be replacing a 4 pole flat, as you can tell this one is pretty beat up and worn, so it has to be replaced. We are going to cut this wire off and we are going to replace this brown wire also. We are going to cut this loose and pull the rest of our wire through, on this trailer here it is pretty open so we can reach the wiring. Just in case though, if your wiring was run in conduit and you are replacing it, do not pull all of this out yet. We will actually tie on the new wires and use these wires to pull them through. We are going to cut off all of this old wire here, and we are going to take off this old light too. I would like to point something out on this 4 pole flat, you will notice there are actually 5 wires coming out of it. What is happening is on the inside of this pin, which is for the running lights, has two wires coming out.
The reason for that is we can split the running light circuit to both sides of the trailer. Mainly that is used on boat trailers and other light duty ones. What is nice about that if you have a running light on the side, chances are your running wire right next to it. You can tap into your wiring without having to make a wire go all the way across. It basically provides a short cut. This case we are going to run it all the way on one side and jump over since we have a small trailer and no running lights. Now we are going to tape our new wires to the old ones and pull it through the frame. It does not take much, just enough to make it smooth so it does not snag anywhere. Now we simply pull the wire through. Before we pull everything through, we are going to make sure we have enough leader to hang out. This unit comes with a pre-wired ground wire so we are going to leave it at its maximum length and this is where we are going to ground it at and well have a good idea of how much slack we need to leave. At this point its a good idea to tape up all the wires together that way it will keep them from getting tangled with anything else. Since we have our ground here we are going to ground it but before that we are going to take this loop off for a smaller one. Since we have an existing ground that works pretty good, we will use a smaller screw. Always give it a twist when you crimp it down it will make a nice tight fit. We will re-install our screw but first we will put a pit of dielectric grease on there to help protect it a little bit, electricity still flows on the ground and the less rust the better. Now we can pull the rest of our slack out.
We have our lights pulled over to the left hand side, we are using the yellow and the brown, yellow for left turn. We need to cut this wire to length about 1/2 to 3/8 inch. The wires then get stuck inside here there is a little strip in here that pulls against it and when you pull it back it catches so it can not come out and makes electrical contact. You bottom out the plastic and give it a little bit of a pull back and it catches. Same thing with the left turn signal. If you notice there is two holes side by side here. You could actually jump another wire from this hole here to another light, so it acts like a miniature junction box. This little channel here hides the wire so when you push it up against your frame it wont get mashed. Your light gets installed just like that. Before we bolt on our light we are going to clean this area out where the holes are that way it makes a good metal to metal contact with no rust and corrosion. You can use a file or scrape it if you are in a hurry but if you can use something more abrasive. You do not have to get these super tight, just snug them down and they will be fine. Again were going to use the old wire to pull the new wire through. Now were back on the right side of the trailer and we will do the same thing, we will run the wires and install a new light. Now we will install our wiring, green for the right turn and brown for the running light. One more final touch will be to run some loom clamps to the wire to keep it up closest to the bed. It does not touch anything, but it is better to keep it out of the way. At this point we will reassemble our trailer and test out the lighting. We have our trailer wired up, lets give it a test run. Notice we did not connect our truck to the trailer so we can make sure our ground wire is working. It is not a good idea to ground through the ball because it can be intermittent from bouncing around going down the road. First we will test the running lights then the turn signals, then the brake lights. We will do this for both sides. There you have it for our install of our trailer wiring harness. We used part number A35W42B and the tail lights we used, the left hand side was part number 432400 and the right hand side was 432200.
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Average Customer Rating: 4.9 out of 5 stars (52 Customer Reviews)
by: Eric C.05/10/2013
Is this review helpful?
This harness made for a seamless installation. I simply tied some string to the ends of my old wiring, pulled it out, and pulled this one back in. Then crimped some connectors on the end and plugged in my lights. My whole trailer re-wire took about 1 hour. This product has the wires bonded together (Grn/Brn & Yel/Brn) for quick and easy installation!79738
by: Chris D.05/02/2013
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Nice to have this length available to help in eliminating splices. 78629
by: Mike Klassen04/25/2013
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I am very satisfied with the product, and the price was very reasonable. I would use this site again for my trailer needs. Thanks!!77775
by: Glen S.04/08/2013
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It looks like just what I wanted, and it will work beautifully, but I have decided to up grade the lights to LED's, because the old 1157s would go out every time I hit a pump in the road, so I have another order to you for those LED lights.74843
by: george03/28/2013
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Very good quality. 73036
by: dan03/12/2013
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Got my order in 2 days. Product was exactly as expected. Will use this site again.70288
by: Dale03/05/2013
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I placed my order on a Tuesday and received it on Thursday. Item was exactly as described. I will definitely order from this company again. 68984
by: Melba03/05/2013
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Got what was needed at a great price without having to shop around and waste gas.68937
by: Dan K02/15/2013
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Hard to find 35 ft trailer wire kit. Needed something longer for guide posts lights. Customer service was awesome - kept me informed every step of the way. Arrived timely and ready to be installed66508
by: Ivan01/30/2013
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For under 13 bucks you can't beat it. Worth every penny.64637
by: Michael01/28/2013
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The wiring harness was perfect but what I was most impressed with was the follow up emails on the shipping arrival and how quick I had received the part.....GREAT JOB!!!64358
by: Dan O01/14/2013
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Nice, easy to install wiring harness. Quality made with good sized wires. Worked great. The extra 10 feet more than other products allowed me to install it without splices.63039
by: victor01/11/2013
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Good quality and fast service 62759
by: nick s01/02/2013
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nothing like new wiring great quick and easy62371
by: Doug O11/28/2012
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Much better quality than I purchased lo cally.60083
by: Pat G11/13/2012
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As ordered, ready to install! 59340
by: John11/12/2012
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I was so happy to work with etrailer!!!! They (John the sales rep.) were VERY helpful and patient with me. I received everything and my trailer lights up and looks awesome with the new LED lights!59266
by: Matt11/06/2012
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Should have bought it when I got new taillights,wa too much time on old wiring issues.Lifted my trailer up on it's side with my tractor and was done in 1/2 hour.Live and Learn. A couple of quick splice connectors for side lights would make it better than excellent.58911
by: Mike Z.11/01/2012
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I really like the videos you have for your product! keep up the good work!58584
by: Kim Trevillian10/23/2012
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I have needed to rewire my snowmobile trailer for a while now. Now I can have trailer lights that work ALL the time! Thank You57944
by: Rich P.10/19/2012
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4 pole 35 foot trailer wire harness. This is a great product. 35 feet is hard to find at marina's. The 25 foot is quite common but is too short for my trailer. Even on line this is the only 35 foot that I found and it did not cost any more than the 25 foot at other web sites.57688
by: SHH - Virginia10/08/2012
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Hard to find wiring harness length beyond 25' at most online retailers. Thanks etrailer.com. Easy transaction and prompt delivery.56723
by: DougP09/20/2012
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Nice wiring kit for a 6-12 foot utility trailer. The only thing missing was the instructions, which were on the website / U-Tube as a video with a written transcript. The only thing that would have made it better would be to include accessories like clips, tap splice connectors or wire nuts. Eventually, also purchased a channel light kit, and running lights. the light kit came with the accessories mentioned and a 25' version, but the wires in that set were not as nice as these. This was a good purchase for my application.55338
by: KP09/04/2012
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I had a short in the wiring on my boat trailer and instead of trying to track it down I decided to just replace the wiring completely. This was more than enough wire for my 18' SeaRay trailer. The extra long ground pigtail is very convenient.53911
by: Brad L.08/28/2012
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This is exactly what I was looking for, but couldn't find at automotive stores. Unbelievably fast shipping! I ordered it on Monday, it arrived on Tuesday!!53345
by: joe08/09/2012
Is this review helpful?
E-100 bumper hitch fit perfect. It seems to be a pretty substantial hitch. I have not tow with it yet but it should work fine. I have not worked with the wiring are connections yet but they seem like they will work just fine. 51192
by: John Y.07/14/2012
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Great product for my home-built camper trailer. I was able to feed all the lights without splicing extra wire in. Fast shipping too! This harness saved me time and money and works great.47978
by: p kline07/10/2012
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Good wire 47416
by: Phil H.05/28/2012
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Easy to use 41847
by: bryce jernigan05/13/2012
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good quality 40266
by: Jon W.05/04/2012
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You won't find this product for a better price. Worked perfectly as described.39361
by: Bill T.03/30/2012
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Order for wiring, round plug, and plug mounting bracket delivered very quickly and is exactly what I needed. Have bought from etrailer.com in the past and always been well satisfied with their products and service.35648
by: JMO03/12/2012
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Just what I wanted......right price and shipped quickly.33593
by: straker03/05/2012
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all good. Good instructions, youtube films with installation guides and prompt delivery. Good product range as well33128
by: Phil B02/23/2012
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Great item just what i was needing and shipped sooner then was told.32258
by: Dale D.02/05/2012
Is this review helpful?
Takes all the guesswork out of trailer rewiring31122
by: Greg M.12/14/2011
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Excellent Quality Products. Just the parts I needed to do the job, Done right the first-time.28115
by: Jd11/21/2011
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Very nice product 27283
by: Curtis S09/01/2011
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Can't wait to use this on my trailer...typical wiring that you would expect for a trailer application. Sturdy connections from the wires to the plug.23372
by: JIm L08/23/2011
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such great service...great pricing...great products!!22559
by: Ps08/19/2011
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What I wanted 22121
by: Rick08/01/2011
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Product as listed - good price - quick shipping20679
by: Jim W.06/13/2011
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The product is fine and will do the job as required. As a novice, I was disappointed not to have some sort of diagram included with the item. A quick Google search gave me what I needed, but I think it should have been included, maybe with some helpful installation tips. The length was greater than I needed, but I coiled the wire in a couple of areas in case I need to make new light connections in the future. This way the wire is there and I won't have to splice in new wires. I'll have to see how the quality holds up over the next couple of years of salt water launches. Price was much better than Lowe's. 16844
by: Mike W.05/27/2011
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I had purchased a replacement harness for my 21 foot boat trailer before looking closely at how the manufacturer had rigged the wiring for the lights. Unfortunately, the running light circuit was run down the left side and wrapped around the rear to the right side making that run over 30 feet and making that harness unusable. The right side did not have retainers (welded to the frame as did the left) to run a true wishbone harness on both sides from the front. This 35 foot harness (though a wishbone) works perfectly to re-rig the lighting as it was originally. No adapting or modifying necessary. 15564
by: Jim C05/13/2011
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I received the wiring harness in soon after ordering it and it was what we needed to rewire our trailer. I was quite pleased. The length allowed for rewiring clearance lights and tail/brake lights, ;lus providing a good ground.13795
by: Jim C05/13/2011
Is this review helpful?
I received the wiring harness in soon after ordering it and it was what we needed to rewire our trailer. I was quite pleased. The length allowed for rewiring clearance lights and tail/brake lights, ;lus providing a good ground.13794
by: Mike C05/03/2011
Is this review helpful?
I bought this wiring harness to re-wire my 28' 1984 Shoreliner Boat trailer. It was too easy to install. The video/suggestions at etrailer.com worked out perfectly and the harness went through the conduit like it was the OEM harness.12777
by: Glen L.12/16/2010
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Customer Service This is my second purchase with etrailer.com. My first was a factory wiring harness for my Ford Escape. Perfect fit and the included directions were right on. I now need to replace the plug on my trailer and it is a 4 prong but has 5 wires which none of the local stores had. Back to etrailer.com where I identified a matching kit with ease. They responded to my orders the same day I placed them and shipped next day with plenty of correspondence during the purchases. The products and service are top knotch. I highly recommend them, you won't be diappointed. Sincerely, Glen Lang4218
by: Jim Mc12/15/2010
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Trailer harness kit Katie, thanks for letting me know the package was delivered and sitting outside my garage door! Your shipping and tracking service is the best I've experienced on internet ordered items. And the kit length enabled me to overcome a few personal errors in repair, with excess wiring left over. Thank you for a good product and great service.4173
by: Shaun11/27/2010
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Great Product Nice wiring kit, super easy to re-wire 20ft boat trailer, for the price of this kit with the wishbone aka extra brown wire makes wiring marker lights a breeze without having to splice3753
by: Kyle A06/04/2012
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Very good customer service andm fast shipping, very pleased 42765
by: L.W.Smith01/01/2011
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fast service the trailer light cable came in 2 days at Christmas time. I didn't expect it so soon. The right product at a good price. thx4875
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