Regardless of you need to move house, go on holiday with a caravan, dispose of green waste, or have a hitch is pretty handy. In this post, we will explain the electrical connection of a trailer hitch of a GMC Sierra . Obviously, regardless if the installation process is not difficult, it is required to explain some details to consider this work without any problem. Firstly, we will see what the electrical wiring harness of your motor vehicle hitch contains, then, in a second step, how to make the electrical connection of the hitch of a GMC Sierra .

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What’s the wiring harness for a GMC Sierra hitch trailer?

Why do we have to connect a wiring harness with the hitch trailer of a GMC Sierra?

So we will begin our article by detailing the basics of a wiring harness of a GMC Sierra. In order to discover how it works, you must already discover its necessity. If you have a trailer or a caravan to tow, it is essential and earlier all mandatory by the highway code to respect certain protocols, here they are:

  • A solid chassis for the trailer…
  • Wheels that fit.
  • An electrical connection.
  • A license plate in plain sight.
  • A stoplight repeater.
  • A traffic light repeater.
  • A blinker repeater.
  • License plate illumination.
  • A fog light repeater.

In order to meet all the electrical obligations, you will need to install a wiring harness connection on the hitch trailer of your GMC Sierra . We will concentrate on this in this post, if you want to discover how to install the hitch of a GMC Sierra, please see our article on this theme.

What is the electrical connection of the trailer hitch of a GMC Sierra?

We will now fairly quickly explain how the electrical connection of your hitch works. The connection uses the 12-volt current from your motor vehicle to power the hitch lights on your GMC Sierra. There are two different systems of electrical connection for a hitch, here they are:

  • The 7-pin electric plug for a GMC Sierra trailer, 7 pins : This is the classic plug that will be determined on all GMC Sierra hitches. This electrical connection will allow you to transmit all the lighting functions necessary for the rear signalling of your trailer, you will find a plug for each action (left and right indicators, ground, fog light, left and right position light, left and right brake light).
  • Electrical connection for caravan with 13-pin plug for GMC Sierra: This plug system is specifically used for caravans that involve 12 volts inside to supply the various electrical gear in the cabin. This sort of connection needs the use of an adapter. The extra pins will bring the 12 volt power permanently (to recharge a battery in the caravan) and the 12 volt power in use (to use the 12 volt equipment when the car is switched on).

How do I hook up the wiring harness of a GMC Sierra?

To conclude this article, we will fairly quickly explain you how to make the connection of the wiring harness of your GMC Sierra .

How to make the connection of the wiring harness of an old GMC Sierra?

To mount the wiring harness of an old GMC Sierra, you will have to go and get all the required cables in the rear lights of this one. We suggest you to call in a motor vehicle electrician to do this intervention because it is difficult, but we will nevertheless summarize the main steps to be performed:

  • Take out the trunk lining from your GMC Sierra to access the rear light unit.
  • Locate the wires that correspond to each of the taillight functions.
  • Connect them to the lugs on the wiring harness on your hitch.
  • Close the whole thing down.

How do you connect the wiring harness of a recent GMC Sierra?

For recent GMC Sierras, the wiring harness is much simpler to connect:

  • You can use a multiplexable box, you will find specific ones for your GMC Sierra and universal models. It’s up to you to select according to your budget, know that a universal version costs between 30 and 60 euros.
  • Take out the trunk lining from your GMC Sierra so that you can route the cables from your box to the front of your GMC Sierra and connect them to your fuse box.
  • Install the case in the trunk properly.
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  • You don’t have to retrieve your cables from the trunk and connect them to your outlet.

How do you hook up the power to a trailer on GMC Sierra?

Finally, to conclude this article we will fairly quickly explain you how to make the electrical connection of a caravan on your GMC Sierra . To get this done you will inevitably have to go through one of the previous steps, it’s up to you to select the one that points your model and your budget. After you have done this, the last step will be to buy an adapter that goes from a 7-pin plug to a 13-pin plug so that you can benefit from the 12 volt current in your caravan. These adapters come at different prices, you will need to count between 15 and 40 euros. All you have to do is plug it into your 7-pin plug.

To get more tips on the GMC Sierra, take a look at the GMC Sierra category.