Wiring a boat trailer is something that many boaters find themselves needing to do sooner or later. I was doing a pre-season inspection of my trailer, which was only 2 years old at the time, and I noticed the ground wire on the trailer is screwed to galvanized metal, and the screw is not tight. The standard four prong connector to connect the trailer to the tow vehicle is perfect for a simple trailer light system.Notice the four prong connector on my boat trailer has 5 wires coming out the bottom. It sounds like you have the wiring modification done since you have the fuses under the dash. You can have your dealer check your VIN to see if this was done, or you can look to see if the modification was done. To send your question you'll need to ENTER THE CAPCHA CODE SHOWN ABOVE into the verification box!
February 22, 2012 Part of successfully building a tiny house trailer is making sure that the actual trailer is street legal including weight limits, width, height, and length allowances, proper lighting, and safe wheels and tires. A week ago we purchased a Haul-Master Deluxe 12 Volt Trailer Light Kit from Harbor Freight for $24.99 as well as a wiring set for about $4.
Our tow vehicle already has a 4-pole vehicle end for the hitch so we knew we were in business with this affordable kit. If no wiring holes are present on your trailer first drill holes suitable for the screws included in kit.
Use the Metal Frame Clips included in the Mounting Hardware Package to mount each half of the Split Y-Style Harness down each side of the trailer. Connect the YELLOW and BROWN wires to the left hand Stop-Tail-turn Light with the Wire Nut Connectors included in the Mounting Hardware Package.
Connect the GREEN and BROWN wires to the right hand Stop-Tail-turn Light with the Wire Nut Connectors included in the Mounting Hardware Package. NOTE: We chose not to use the wire nuts and instead use heat shrink tubing so as to make a more solid connection that will last longer in transit and weather. To see photos of our experience as well as a special photo of the Tiniest r(E)volution adding her experience to the mix please visit our Flickr site!
Equip yourself with the skills to gain corporate sponsors and partners for your tiny house build. Created and edited by Kent Griswold of Tiny House Blog, Tiny House Magazine is the only magazine for micro, tiny, small, and unconventional tiny house enthusiasts. View on FacebookTiny r(E)volution 1 day ago Now that we are #smallhomestead living my fields of interest are varying just a bit. Im lost, and am about 2 days away from just going and getting a whole nother new wiring kit and starting over. Pictured below is the Pollak 7 way connector, which is the connector style in most common use on RV trailers and is becoming increasingly popular on horse and utility trailers. As you can see in the illustration below the back side of the connector body is labeled at each terminal. On the tow vehicle side with the exception of 96-98 Ford and Dodge pickups and SUV's with factory installed trailer wiring, wire color alone should not be relied on, always test and match the function to the appropriate terminal.


It should be noted below that the center terminal is labeled as an auxiliary circuit, most commonly used for backup lights not a ground terminal as many try to make it. Also after the connector diagrams find more information on wire colors used by GM, Ford, and Dodge. This chart should be used as a general guide only, you should always test before connecting your wiring. Caution if your vehicle has a diagnostic indicator that tells you when a lamp is burned out or not functioning, you may need special wiring adapters and testers.
In addition to the above some cars and trucks have a separate light for the brake light, most commonly identified by amber turn lenses in the rear. The common flat 4 wire connector used on boat, snowmobile, and light utility trailers most commonly uses the following code.
When using vehicle manufacturer supplied brake control connector harness, DO NOT match colors, consult the charts below.
Dodge vehicles with this package are equipped with a 15 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. Ford vehicles with this package are equipped with a 20 amp fused power line which is insufficient for 3 & 4 axle (6 or 8 brake) applications. It may be to just connect the trailer lights on your vehicle, or you may find yourself rewiring the whole trailer with new LED boat trailer lights and a new wire harness.I have had light issues on an old trailer and to be honest it was quicker and way less hassle just to pull out the old wiring and lights and start again with a fresh wire harness and new lights. A sure fire source of light problems!Make sure the ground wire on the trailer is attached to bare metal, not to painted or galvanized metal. I pulled both the red 10a fuses from under the dash, and checked to make sure I had voltage to them.
While we have already sandblasted our trailer, primed and painted it, replaced an old tire (which we have now decided to replace them all), and added new leaf springs and hardware, it was time this past Saturday to add the proper lights for breaking, turning, and otherwise signaling. Now I would love to say that the process of installing these lights was incredibly difficult and by installing them I was showcasing my electrical prowess.
You can see below the run of the wires from the rear of the trailer to the tow vehicle hitch.
Run the YELLOW and BROWN wires down the left side and GREEN and BROWN wires down the right side of the trailer. Connect each wire from the Marker Clearance Lights to the BROWN wire on each half of the Split Y-Style Harness.
If the turn signals on the Light Kit do not illuminate, check the connections between the towing vehicle’s wiring and the Color Coded Trunk Harness.
Speaking of regulations, do you know what the maximum legal width is before you have to get a permit? I appreciate your comments and while I don’t care for our blog to be in the news I would dislike even more us to make the news due to an accident. This downloadable e-Book will give you the confidence and integrity to approach any sponsor with a Win-Win attitude. Available in PDF and for both iOS and Android devices, the magazine is a digital gem for the tiny house set!


This connector is also manufactured by the Theodore Bargman Company and there are also some generics around.
Any plug that has been changed or extended, along with horse and utility trailers should be tested when replacing for any reason to be sure the function matches the terminal. In past 2-3 years manufacturers have begun to match the wire colors to the code for the common 7 way RV connector. The orange and blue wires are in a separate bundle taped to the wire harness that runs down the frame on the drivers side. For 3 & 4 axle (6 or 8 brake) applications a separate power wire should be installed directly from the battery positive to the brake control and should include an inline 30 amp auto reset circuit breaker. Truth of the matter is it is rather easy to wire up a trailer and once you are familiar with what your hitch has, what your kit has, and what you need to be street legal, the rest is just a bit of elbow grease. The brighter Stop Lights should turn on only when the vehicle’s brake pedal is depressed, or when the vehicle’s turn signal is activated (ignition key must be in its “on” position).
And as an added bonus we have included templates for email requests, traditional letters, and even cold calls. They are supposed to be interchangeable and the wiring color code is maintained among the various brands. A white wire may also be found in that bundle, it is a brake light wire which is not normally used for trailer wiring.
Many light assemblies use the mounting bolts as their ground connection, so clean the metal surface around the mounting bolt holes down to bare metal.
The single most common cause of trailer lighting problems is a poor ground on the tow vehicle or trailer. Poor ground connection to the trailer frame is a common problem with lights that don't work.Below is a simple wire diagram for a standard four wire light harness. They are available at marine hardware stores and are a crimp connector with a waterproofing adhesive inside and an integral heat shrink cover to seal the connection.
My wife and I were living on my View on Facebook·ShareTiny r(E)volution 4 days ago Have you ever seen a more beautiful and comfortable looking park model? The white wire (ground) on the following boat trailer wiring diagram is drawn in grey so that you can see it against the white background. One to control the boat trailer brakes, and one auxiliary power to charge the battery that you will need to have on the trailer so the brakes can be energized should the trailer come unhitched from the tow vehicle.Obviously you will need a six prong connector to connect the trailer to the tow vehicle in this situation.
And while I'm at it, have you ever seen a better looking magazine for micro, tiny, small, and otherwise, unconventional, home enthusiasts?



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