How to wire a trailer

Wiring a trailer or an RV (Recreational Vehicle) involves a lot of variables. Although most manufacturers follow a standardized pattern, there are mavericks that’d prefer to go slightly different. I intend to explain to you how to wire a trailer in a scenario that’s most common and the ones that you’re more probable to be facing.


First things first, routing the wiring through your frame is utmost important. Make sure that all the wires are very well tucked within the frame and that they could not come in contact with or rub with anything, while operating.

If the one you own is a square tube trailer, the best way to route the wires would be through the insides of the tubes. This would make it look much neater and will also protect the wiring, as I mentioned above.


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It would be highly advisable to drill in a few holes in the tubes, in case the manufacturer hasn’t done it, and fish the wires out. This may take slightly longer and seem tedious from the sound of it, but trust me, you’ll only be happier in the long run with the results. Also make sure that the holes are sealed well in order to avoid any water dripping or leaking into your frame.

If the one you own is a U-Channel trailer or of the angle iron make, you are spared the effort of drilling. In this case you will need to clip the wires tightly inside the frame using clips that are specially made for this. You should be able to find these clips in most of the automotive stores around you.

A little more depth into how to wire a trailer:

There are 4-wire, 6-wire and 7-wire connectors that are used to connect a trailer to the vehicle.


4-wire connectors are the most commonly used ones and contain 3 exposed posts called “Male” connectors and 3 sockets called the “Female” connectors. The one left out is the ground. The male connector goes to the trailer side and the female goes to the vehicle side in this arrangement. This is done to ensure that the male connector is not exposed when your vehicle is ON and you don’t have a trailer connected.

6-wire connectors have 2 additional poles and the male “Plug”, as it is called in this case, has a protecting covering that makes sure that the prongs inside the plug do not come in contact with anything. So, the male and female roles are reversed in this one.

7-wire connectors are much like 6-wire connectors except for that they let you hook up another 12v source circuit to your vehicle using dedicated batteries. This lets you have a back up.

I hope my guide on how to wire a trailer has been helpful to you.

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