Daulton R.
11/8/2023
Thank you for providing the guidance and instruction that you do. It is extremely helpful for a lot of people. The more I visit your site the more I want to come back for help, and purchase from you.
Jenny N.
11/16/2023
Daulton
11/17/2023
Jenny N.
11/17/2023
Daulton
11/18/2023
Pj
10/26/2023
We bought a brand new 2023 dump trailer at auction. It was made in Mexico and does not have standard color-coded wiring. We have all lights and brakes, but when we turn on the headlights of the tow vehicle, the brakes on the trailer come on and stay on.
Mike L.
11/12/2023
Helpful Links
Char
10/21/2023
I have a 2008 Dodge Ram 1500, with an unplugged blue plug labelled "Electric Brake" under the dash, but only a 4-flat connector at the rear. What do I need in order to utilize the electric brakes on my trailer?
Nik C.
10/24/2023
Mike L.
11/9/2023
Mike L.
11/9/2023
John M.
10/17/2023
I have purchased a used 1992 Bigfoot 17 travel trailer. When connected to my 2009 Dodge Nitro I get RT and LT lights working properly, as are the brake lights and flashing lights.. I do not get running lights working. My buddy connected with his 2015 Cherokee and we got the same result. I have replaced the 7 pin connector - thinking it was faulty - but the same situation exists. My buddy's Cherokee has factory installed trailer brake and when he pulled the trailer the brakes seemed to be working ok. The 12V trailer battery has not been connected through all of this testing. Your thoughts please. Thanks.....john
Mike L.
10/17/2023
Charles
10/10/2023
Hello, I just got a vintage 1988 mallard 28rks 5th wheel. When I got it all d.c. and 12 volt items worked. May have been on shore power I'm not sure. Anyway after trying to hook up the battery nothing worked not even a light. Checked converter all connections look correct. Followed out. Negative is a copper wire coming of Negative of panel going to bus then down into floor to frame. Positive I followed to crossover where it goes into the wall. Another black wire comes out of the wall and goes toward battery. From what I can tell, black Positive wire goes to 6 pin connector which goes to a box with 3 wires all black not hooked up and the ground wire on the connector is not attached at the screw. 1, is this the issue? 2. Can I connect all 3 wires with no issue. 3. Technically can't I hook all to positive as long as my negative goes to frame as needed. Thanks
Mike L.
10/11/2023
Beth
9/18/2023
I want to put a wireless backup camera on my travel trailer, wired into a rear marker light. However, I'm told this camera won't work if I'm pulling the trailer with my 2021 GMC Sierra, because of something called "Pulse wave modulation" causing the camera to not get enough voltage to work? Is there a solution or work-around for this issue?
Beth
9/19/2023
Mike L.
9/19/2023
Beth
9/20/2023
Murat
9/10/2023
Hello All. I need help with loosing power on my Prolite Plus S. After 3 months we went to a short trip and on our stop suddenly light went off inside the camper. It was connected to my Model 3 through Curtis bluetooth controller. When I check the car side power with a multimeter there was no power coming to 7pin connector( I learned that model 3 have electronic breakers it reset it self after sometime). Wait for 24 hours and connected the controller back to car and started to work. Then I connected to camper and loose the power again. I think there is short in the camper but I checked the all fuses and breakers they were all good. Please any idea helps…
Mike L.
9/14/2023
Kennys
8/21/2023
Can anybody tell me if the batt wire lead on a 7-pin can be used to keep a 12v Batt charged that is used to run aerators on my fish hauling trailer? Is there any amp output info available?
Mike L.
8/22/2023
Phil L.
8/9/2023
Where can I find yellow & brown & green & brown trailer wires together to rewire my utility trailer
Mike L.
8/10/2023
Craig V.
7/19/2023
Have a 2018 camper which is almost brand new used very little keeps blowing left turn signal fuse. Also have 2001 Hallmark trailer that blows the same fuse hard to believe 2 trailers have shorts on same circuit. Think it could be on the truck side?
Mike L.
8/2/2023
Russ
7/17/2023
OK so just bought an older RV and it has a 4 Pole round socket at the hitch, I have use of a small trailer with a 7 blade round plug. Question is is there an adapter available to plug the 7 into the 4 on the RV? The 7 blade was used on trailer to plug into a truck with an existing 7 blade at the hitch but trailer has no brake, back up light or 12v supply.
Russ
8/2/2023
Russell
6/29/2023
I have a 7 & a 4 pin connector on my 2020 rv my question is I have a hitch mounted storage box that needs lights and a reverse light I was thinking of using the 7 pin for storage box and 4 pin for boat lights, would there be a problem with that? Also what wire on the 7 pin is reverse light? Thanks
Heather A.
7/17/2023
Jose A.
6/25/2023
I have a 7 pin connector but the wires that were ran do not have a blue wire. Just green black brown yellow red. I hooked wires up with out the blue and the back tire on my trailer locks up?
Mike L.
7/15/2023
Marc
6/5/2023
Hello I have a 2012 Jayco X23b. I am having a problem with the right rear light assembly. Under normal conditions, the brake light and turn signal on the right side work as they should but when you turn on your marker lights for the entire trailer, the right rear light becomes extremely bright, will not show the brake light working or the turn signal. Just stay is extremely bright. Now if you turn the power off to the marker lights, it works like it should turn signal and brake light work together. it is not on the vehicle side I pull a boat trailer and a flatbed trailer as well and do not have that issue with either one of them. Any ideas.???
Mike L.
6/6/2023
Hi S.
6/3/2023
I'm towing a small 8 trailer with my 2019 1500 silverado and when the truck is off and trailer is still hooked up to my 4 pin flat connector the lights on the trailer will dimly flash occasionally? What can I do to fix this issue?
Michael
4/27/2023
I purchased a Tekonsha T-one Wiring Harness With 4-pole Flat Trailer Connector for my 2017 Range Rover Sport, I tested it and it doesn't seem to receive any electricity. The fuse is ok. I hope someone can give me some advice.
Mike L.
4/27/2023
Helpful Links
Michael
4/27/2023
Michael
4/27/2023
Mike L.
4/27/2023
Derek
4/17/2023
Brakes not working on 5th wheel, 2012 Montana 3400rl brakes not working, use a 2013 chevy 2500hd truck. I hook up camper cable to truck all the lights work but while doing a brake test nothing no trailer brakes even slideing brake controler form low to highest nothing no change. truck does not even acknowledge trailer brake hookup. I changed truck plug first easy enough no change, could not find any bad wires under camper from brakes, check ground wires nothing I did just get new tires put on not sure if that could have done it, before I start spending more money for no change, I could use some advise on this problem..please.
Marcus
2/12/2023
I have a Tekonsha Primus IQ and the wires in my 2022 Tahoe are run but not in a connector. There is a wire labeled “to trailer” does this go to the input or output of the wiring harness?
Mike L.
2/15/2023
Phil
2/6/2023
Installing 4 wireless security cameras, 3 inside 1 outside on horse trailer. Should I tap into running lights for power or is there a better way to approach this?
Mike L.
2/8/2023
Mike L.
3/27/2023
Skyler R.
12/5/2022
I'm having trouble wiring in a new 7 pin plug on my pressure washer trailer. I only have 6 wires: Red White Black Yellow Green and Brown. When I hook the connector to my truck, one tail light comes on, no brake lights and turn blinkers on they all blink. Guess I need to know what the color codes are and if it could be a ground somewhere else. Thanks
Mike L.
12/5/2022
Helpful Links
Skyler R.
12/5/2022
Joe H.
12/4/2022
I have a 6x12 enclosed trailer that all the lights and signals work the way they should. When it's plugged into my 2018 f150 and press the brakes I get the trailer disconnected message. When I let off the brakes I get the trailer connected message. I have found that I have a ground on the brown lead of the wiring harness. I have traced the wiring throughout the trailer but can't seem to find any issues. Any ideas? Thanks
Mike L.
12/5/2022
Justin
1/26/2023
Mike L.
1/26/2023
Helpful Links
Andrew H.
8/2/2022
Hi I have a f150 2018, every time I pull my travel trailer my drunk battery dies. Just finished a long trip during which I had my alternator changed but still ended up with the same problem. Any ideas what could be the problem?
David B.
8/3/2022
Cory E.
7/1/2022
I got a 1973 camper and the trailer plug is gone. Can't figure out the wiring for a new one. It has red green white black wires.
David B.
7/1/2022
Koreyk
10/23/2022
Dennis P.
6/30/2022
I work for a paving and excavating company, we have a 32’, dual axel, dovetail trailer w/ 8’ hydraulic lift ramps…the trailer gets pulled by a 2022 peterbilt 567 tri axel dump truck 7 pin connector…I would like to know the best way to set up so when the trailer is being towed it will charge, or at least maintain, the trailer battery for the ramps?? Thanks in advance!
David B.
7/1/2022
Helpful Links
Joey F.
5/3/2022
Helping my neighbor out. When he connects his trailers flat wire harness to his truck during the day everything works perfectly but come night time when his vehicle sensor comes on to turn on the headlights automatically his trailer lights goes out and stops working.
David B.
5/3/2022
Jason
11/27/2022
Mike L.
12/1/2022
Mike L.
12/1/2022
John M.
4/19/2022
I just purchased a 2004 shadow master 6x12 enclosed single axle trailer. I have power at my connection on my truck but I get nothing lighting up on the trailer at all. the harness for the trailer ends up going inside the frame near the tounge. How to I figure out what's going on?
David B.
4/19/2022
Ben M.
4/10/2022
I installed self-adjusting brakes and when the tow vehicles brakes are activated I can hear a hum from the assembly (which I'm assuming is the magnet activating) but the brakes don't do anything. From an adjustment standpoint the brakes are making contact with the hub when not activated so I think their baseline adjustment is ok. Any thoughts on what I'm overlooking?
David B.
4/13/2022
Helpful Links
Gary
10/5/2022
David B.
10/6/2022
Helpful Links
David B.
4/7/2022
2 trailers;both are wired w/4wire conn. I want to add 2" recv.on larger one and tow the 2nd. I need to run 4wire conn. from Ist to 2nd, How and what do I need to accomplish this? Thank you for your time and advice.
David B.
4/13/2022
Mike R.
3/27/2022
I want to wire my trailer for tail, brake lights with left and right turn signals. The tail lights only have 2 wires and the wire I bought has 4 wires with flat plug in to truck. With only 2 wires on the tail light, what wires do I use of the 4 coming from the truck
Les D.
3/28/2022
Helpful Links
Mark B.
3/14/2022
We have a 7 pin harness on trailer. Most lights work ok but the left blinker only works when the right blinker is activated. Right doesn’t activate with left. Brake light is also inconsistent in working. Thoughts on where to start looking. This site and article is super helpful
Les D.
3/15/2022
Helpful Links
Brent G.
2/21/2022
I have a new Charmac cargo trailer that all exterior lights work properly, but the interior lights will only work if the truck is running??? I want them to be operable with the truck off and keys out out the ignition
Les D.
2/21/2022
Joe W.
12/29/2021
I have a 2017 Ford T150 van with 4/7 connector. When I have any trailer attached, the right turn signals flash really fast on the van, but the signals on the trailer don't work. Running lights, left turns, brakes, all work normal. Is this a ground? fuse? flasher plug? Everything works normal with no trailer attached.
Les D.
12/29/2021
Louis H.
12/14/2021
I have a 2011 toyota tacoma with a new T-one harness installed. I have a new 4 pin trailer harness with led lights installed on a 5x8 tilt trailer. Problem is everything works properly with my lights turned off on the truck but with them turned on: seems like the trailer brake lights are on constantly, no turn signals or variance when the brake is applied.
Les D.
12/15/2021
Helpful Links
Wendell S.
11/9/2021
I have a 1999 Chevy Silverado I was hooking up a 7 pin connector I have a light green wire coming from my wine out of my truck with no place to hook it to in the 7-pin where does the light green wire hook up to you
Les D.
11/12/2021
Helpful Links
Matt
10/18/2021
Ok so I have my wires run and ready to connect on my trailer. I am putting in new LED lights and ran a flat 4 wire connector. I know I need to run the brown wire to my black wire, but where do I run the ground wire from the light? The ground wire is only about 8 inches long. And grounds to the tongue. What do I do with the other wire on the light?
Les D.
10/19/2021
Heather V.
10/8/2021
I have a 2011 F350 turbo diesel with a factory towing package. It has two 7-way plugs, one in the bed and one under the bumper. The trailer running/tail lights stopped working. When I checked the truck 7-way plug at the bumper, I had power at the pin but no trailer lights. Trailer service checked trailer said the lights all worked in the shop both with testing and connecting to another truck. The next thing the happened was the right trailer brake/turn light was dim, then it went out. I now only have the left brake/turn on the trailer. Please help me, I believe there are several fuses and at least two relays in the wiring harness. I am not sure where to start tracing this problem.
Les D.
10/19/2021
Aj P.
9/28/2021
I got a older haulmark elite 2 race trailer. 7 pin plug. Hooked up everything. Bought new lights for it because I thought the old ones were bad because they didn’t work. All the wires under the trailer seem fine. Has a battery for electric breaks. Do I need a new battery for the brake lights and running lights to work. No lights or anything work on this trailer
Les D.
10/19/2021
Helpful Links
Carlo N.
9/28/2021
I have a 28ft toy hauler, I put new brakes on &now I have a problem no brakes.
Les D.
10/19/2021
Helpful Links
Bill J.
9/26/2021
I have a new to me, 1995 2-axle, 2-horse WW trailer. It has the standard 7-pin connector and electric brakes. All the lighting work, however, the breaks become engaged as soon as the vehicle key is turned on. I've connected the trailer to two different vehicles with the same result. Somehow the breaks are getting voltage to engage even when the break petal is not pushed. Now i can't pull the trailer because the break system is always "on". Any thoughts on what's happening?
Les D.
10/19/2021
Mokp
9/23/2021
I have a big Tex utility trailer and with a seven plug connector and whatever it drives it appears that the brakes are on I looked at the wiring underneath and somebody has connected the ground to the power for the brakes what the hell is this a standard configuration or what can I do about it
Les D.
10/19/2021
Helpful Links
Danny S.
9/1/2021
Hello. , I have a typical 2008 6x14 enclosed trailer , all the lights work great when plugged into my 2011 Tahoe but only 1 brake light and 1 blinker works when plugged into my 2001 Silverado 1500. , using the same adapter to each vehicle. Are these vehicles wired differently ?
Victoria B.
9/7/2021
Manny R.
8/20/2021
I have a 2014 GMC Yukon, 7 pin factory plug. I bought a trailer wired for 7 pin with an electric hitch. The electric hitch does not work on my truck but works on the truck the previous owner had, I believe it was a Toyota. Can someone point me in the right direction?
Victoria B.
8/26/2021
Darrell M.
8/19/2021
I connected a new 7-way to my truck for my trailer and brakes however now when everything seems to work but my running lights stay on after everything is off the keys off and they do not turn off I can unplug the main plug the tail lights will go off but if I turn the lights back on the tail light stay on again. And I'm using all standard bulbs no LEDs
Victoria B.
8/23/2021
Darrell M.
8/24/2021
Matt W.
8/17/2021
I have a travel trailer and a utility trailer and I am towing with a 2019 tundra. Both have a 7 way plug. Towing the travel trailer, everything is fine. Whenever I am towing my utility trailer it constantly shows the trailer comes disconnected. This is most annoying. I have traced it down to the trailer brake system, but was unable to figure out anything from there. I notice above it shows different wiring configs for RV and Utility. Could this be the issue? I have noticed it one other time when towing another utility trailer? Is there an adapter, that I can use to eleviate this issue?
Victoria B.
8/19/2021
Wayne F.
7/30/2021
I have a 2008 TAB trailer that has a 7 pin connector. When hooked up to a vehicle with 7 pins all lights work correctly. I have a 1994 Chevy pickup with 6 pin and a 2015 outback with a 4 pin. Using a 6 pin to 7 pin or a 4 pin to a 7 pin brake lights ok, left turn signal work ok. running lights ok. Right turn signal all lights are blinking on the trailer. What can I look for?
Victoria B.
8/4/2021
Fidel B.
7/19/2021
By screwing the connection box of my 7 pin wire under the clip of my fifth wheel m I crushed a wire and there was smoking, so I closed the master switch of the battery. The 7 pin cable was not connected after my pick up. My q question is it would be the wire of the brakes that I would have to pierce with the aim which would have caused a short circuit. Thank you for your good advice,
Jon G.
7/20/2021
Jim N.
7/6/2021
I have a 2019 GMC Seirra Denali and I bought a new car hauler. The problem is I bought it about 200 miles away and the left signal light dosen't work. Since it would cost more to haul it back than pay someone to repair it. I have checked all the connections I can find and checked the bulb all are fine. Any help will be appreciated.
Jon G.
7/8/2021
Helpful Links
Al
6/16/2021
What a great article very informative. I do have a question. I am switch my old rv tail lights to a led tail light. Upon looking at the wiring it has 4 wires coming out hooked to old light. New light has 3 wires from partsam light. I am going to systematically test each to find out what works what. But does any of those effect my trailer brakes, like if I hook them up wrong? Because I’m going to have to combine 2 of the wires together so they can connect to one of the three wires? Right help!
Jon G.
6/22/2021
Plumberjohn
5/24/2021
I have a 1973 slide-in truck camper. I'm trying to connect the electrical pigtail from my 2002 Chevrolet Silverado. The slide-in truck camper had a 6 Pin round (male), and the truck has a 7 Blade round (male). Is there an adapter or cable to make this possible? I'm not able to determine what pin does what on the slide-in truck camper. Any advice is greatly appreciated! Thanks!
Clifford B.
5/23/2021
I have a 2009 Ford F 150 with the 7round plug and a 4 flat wire plug I can use either one just bought a new set of magnetic lights with red and orange lens and already have the led lights mounted in the trailer only all lights work when head lights on truck are turned but no brake or turn signals I have a 7 pin to flat 4 round connector why is it that the lights work but not the brake or turn signals
Jon G.
5/25/2021
Gary S.
5/16/2021
I have a Wells Cargo Auto Hauler trailer. Originally in the black box that houses all the connections (located on the front tongue) there was a diode in-line with one of the wires. My friend borrowed the trailer, and somehow burnt out (melted!) the wiring. Now the back up lights on my 2006 Dodge Ram 3500 stay lit when I plug in the 7 blade connector. How can I fix this, or what part/wiring kit do I need? Much tanks.
Jon G.
5/17/2021
Jim S.
5/15/2021
I have a 2021 VW ID.4 which come pre-wired for 7 pin connections, while the kayak trailer on has only 4 pins. What solutions are there
Jon G.
5/17/2021
Jake W.
5/8/2021
the 2003 ford psd wire colors are not the same as you are claiming. at least on my truck. i know. im trying to rewire a new plug in right now. keep blowing fuses.
Jon G.
5/10/2021
Shannon
5/5/2021
How can I run a 12v fuel pump into a 7 pin and control the power from a uplifter switch in the cab of my truck Ford F-250 super duty
Jon G.
5/6/2021
Steve
5/3/2021
I have a 2020 G M C truck I wonder can I use the light wire to charge my battery to my power winch it a lawn mower battery ? If I turn my lights on while running ? That the flat 4 plug .
Jon G.
5/4/2021
Ben
4/30/2021
Without turning the mini van on I have full lights on, brake, left and right work perfectly. New cable harness. I need to disconnect the trailer connector to kill the running lights. Any ideas
Jon G.
5/3/2021
Bob C.
4/20/2021
Hi. What is the best way to add a third brake light on a camper shell mounted on a 2002 GMC Sonoma SLS? I have a junkyard rescue shell that does not have a third brake light and will mount an aftermarket LED but I am not sure if a hot wire is available. Just need advice from more knowledgeable folks
Jon G.
4/22/2021
Edward R.
4/18/2021
Hi! I have a 2012 RAM 1500 quad cab which has the standard incandescent lights. I’m building an Wind Stream 24ft utility trailer with LED LIGHTS. Question is “Do I need to have a converter to control the return voltage to control and protect the fuse panel in the truck?”
Jon G.
4/20/2021
Craig W.
4/16/2021
I need to wire a four flat to the back of my camp trailer in order to connect to small aluminum trailer which already has a four flat. Any advice on this project would be helpful.
Gordon S.
12/11/2021
Matt S.
4/2/2021
Is there a ASME, NEMA or other standard that controls the pin diameter and spacing of 4-flat plugs? I have several trailers with 4-flat plugs and the spacing and diameters, while similar, do not appear to be the same, which makes it difficult to plug into some and loose connections on others.
Jon G.
4/3/2021
Butch
3/29/2021
I have a 2001 Ford f250 super duty truck, I just purchase a sure trac enclosed trailer and moved to Florida. All the lights work on the trailer however I cannot get the Interior dome lights to work. I watched a you tube video to where a man said that his Chevy truck did not have the fuses installed in the fuse box, can anyone tell me what fuses I need to check and have installed? Any help would be appreciated.
Jon G.
4/2/2021
Willie J.
3/28/2021
Hey, I just brought a used Carry-On trailer with a 7way flat and it have three wires on the left side and two wires on right side running from the rear for clearance marker and tail lights . With only one oval LED fixture at rear on each side. Do I need a 5 to 4 converter? My truck is 2010 Ford F-150 with turn/brake is feed from the same wire.
Bill F.
3/25/2021
Need to go from 4 wire flat on motorcycle to 9 wire round on a can am motorcycle trailer. It is a 2018 Honda motorcycle.
Kef G.
3/25/2021
Drew M.
3/16/2021
I have 6 wires going into a 7 wire plug. None of the wires are blue and my electric brakes do not work. The only blue wire I see goes to a junction box on trailer w/black wire. How should I wire the plug? Should the black act as the blue wire? Very frustrating
Jon G.
3/18/2021
Richard H.
3/14/2021
I am rebuilding an old aluminum trailer and have purchased new replacement sidemarker lights. Because the metals react to each other and corrode, I have put a silicone gasket between the two metals. Will this cause a grounding issue? I have done the same with the new taillights. Thx!
Neil W.
11/12/2023
Awesome page. I’m trying to replace my 6-pin plug with a 7-pin on my gooseneck trailer. Brakes have worked great with an adapter in the past. When I look at the wiring in the 6-pin, the brake pin is not connected and there isn’t a blue wire. Just a black wire on the 12V center pin. I noticed the page said “Note: In some applications, the black battery power connection and the blue brake controller output connection are reversed.” I’m totally confused how the brakes have been working with the factory brake controller without the brake pin being used. Any help would be appreciated.