How to Convert A 4-Flat to Fit a 7-Way Trailer Wiring Harness (Lights Only)
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- เผยแพร่เมื่อ 2 ธ.ค. 2019
- Does your vehicle have a 4-Flat trailer wiring harness, but you need to tow a trailer with a 7-Way harness? In this video we go over how easy and fast it is to convert a 4-Flat harness to a 7-Way harness using U-Haul part# 47185. This conversion will work for the taillight functions, but trailer brakes are not connected.
To purchase this product and other towing accessories visit www.uhaul.com/trailer-hitches...
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Please make a video explaining how to attach the other 3 wires that you cut off
th-cam.com/video/hqze3Qgz-Ng/w-d-xo.html here you go!
blue if your trrailer has electric brakes, black for 12v aux, purple for surge brakes
You did a nice job
Thank you!
Work 100%
Tanks ver good
Hi, is there a way to convert the 4 pin trailer to feed a 12v amber light?
Thank you for this info!!
Why would you just do the lights if you had a 7-pin connector? I have a Telluride with a 4-pin connector but a 7-pin harness. I need the brake function (and reverse) so I can hook it up properly to a tear-drop camputer.
Is there a video on how to connect the other wires you didn't install ?
Here you go! th-cam.com/video/hqze3Qgz-Ng/w-d-xo.html
Does wiring it this way give ability to trickle charge deep cell batteries while driving?
Blue wire is for the brake controller output to the trailer brakes. The black wire is a 12V B+.... DO NOT wire this to your trailer brake wire. You will destroy your trailer brakes. I realize this is a vehicle only application specific video, but it helps to tell people.
Some of your customers tow trailers with batteries which charge off the center pin such as horse trailers, equipment trailers, RVs, Boat trailers, etc.
The other thing I often do is install a relay so that wire is only powered key on and not key off. Otherwise you will have a dead battery if you don’t unplug your trailer connection and wonder why. (That is an expensive road call 25 miles out in the woods on logging roads if you’re hunting)
U-Haul has standardized wiring it seems, but not everyone has. Wire by function and test if you are a DIYer. It will save you money. Not that I don’t enjoy your business, but sometimes my paycheck comes from your ruined vacation!
Other than that, great job!
We always carry black & decker battery jump 12v backup- 800 cranking amps.
Hi, at 2:20 Aaron mentions a mounting plate you can attach to your hitch. It extends away from the hitch. Where is that part on the Uhaul site? I need that kind of plate for my hitch set up. Thanks
www.uhaul.com/MovingSupplies/Wiring-Lights/Tow-Vehicle-Wiring/Electrical-Mounting-Bracket/?id=17332
Try the Curt brand. Curt 58000
Does 7 wire include brakes also
What color would I run to the battery to pull power my trailer has a fan?
You would run the black wire! Just make sure you put the appropriate fuse in place on that wire using a fuse holder when attaching to the battery.
black is your 12v aux, hook directly to battery via fuse if you want
why did you not show how the bracket attached to the hitch you just showed it sticking out like it came that way?
What is the 7 wires under my 2006 Chevrolet express 1500? Can I connect this directly to?
Some vehicles will have all the wires already there for you to hookup. Just check it with a circuit tester to see if they are the correct functions!
What do you do if your trailer has electric brakes? Don't you need the black wire run to the battery?
then blue wire, black is for 12v aux
did you cut the white wire from the four way and then attach to grounding under vehicle. I cant tell if there is 3 or 4 wires still running to the 4 way connect?
The white wire is sperate from the 4 flat on the 7-way. It uses a larger gauge wire so we ground it to the frame. The white wire on the vehicle end's 4-flat is usually a smaller gauge and hooking up different sizes of wire can cause issues down the road.
@@aaronlimon4803 should the lights work without installing the white ground wire? I just tested it before doing the drilling and I had no power to the trailer lights.
Very crude position for that connector. Keep BandAids handy for all the cuts to your legs.
Hey guys! After reading some comments I'd like to clarify some things. This conversion is for lights only. The trailer the customer owned did not have trailer brakes or need a charge line which is why we did not use those wires. If your trailer has trailer brakes you need to run the blue wire to the brake controller to hook up. If you need power, run the black wire to the battery and connect with a fuse holder and an appropriate fuse. The route to the engine compartment or firewall for those wires are different on every vehicle, but generally you want to follow the brake lines underneath the vehicle. For the purple wire, you just need to connect to the reverse light wire on the taillight. We see how important this is and will have a video out on how to hook those up soon.
If don’t attach the white ground wire to anything do the lights still work? I did what you did except Didn’t attach the ground but the lights don’t work… Not sure why
you should make a video if the trailer has brakes
@@jwhammond1 You're joking right?
Never did that vid huh? Can't find it..
@@windygorge1 th-cam.com/video/hqze3Qgz-Ng/w-d-xo.html
What is the proper name for that I need one really bac
Part number 47185 at most U-Haul location!
Would it be okay to install the mounting bracket to my bumper if my bumper is plastic?
Dustin Valdez no
If mounting to a plastic bumper use a bolt and nut. Self tapping screws can come loose over time.
My question is
My vehicle has a 7 pin harness a uhaul has a 4 flat. Do u need anything special?
We sell converters in almost all U-Haul centers! You can also purchase one here - www.uhaul.com/MovingSupplies/Wiring-Lights/Adapters/Trailer-Adapter-(Nite-Glow)/?id=720
@U-Haul Trailer Hitches And Towing yea I did some searching. Found a 7pin to a 4/5 flat. Thx tho
Look like canelo brother
Who in their right mind "trims" wires that short.. Congrats, if you change your mind, you're SOL in the future
So you changed out the plug to tow a big trailer but you cut the brake wire.what would be the point of this? If you're going to tow a trailer you wanted to have brakes.
And if you have a tiny trailer with a four-pin connector you don't need the brakes.
There are trailers that have a 7-Way plug with no brakes, so no need for the electric brake wire. For a full 7-Way conversion you should see our video for that th-cam.com/video/hqze3Qgz-Ng/w-d-xo.html
😅
Must not have been his own truck. That setup looks half azz
Very bad video and it should be removed. It doesn't tell you that it doesn't provide for trailer brakes and could cause someone to improperly install without brakes. A serious accident could be caused by this poorly thought out video.
The title says "lights only".
Here is the conversion video that uses the brake wire - th-cam.com/video/hqze3Qgz-Ng/w-d-xo.html . With everything hooked up like the video, all you will need is the Curt Brake controller. They also have an app to help control and adjust.