Whether you need to move house, go on vacation with a caravan, dispose of green waste, or have a hitch is pretty handy. In this article, we will explain the electrical connection of a trailer hitch of a Mercedes Gla . In actual fact, even if the installation procedure is not difficult, it is necessary to explain some points to consider this intervention without any issue. Firstly, we will find out what the electrical wiring harness of your car hitch involves, then, in a second step, how to make the electrical connection of the hitch of a Mercedes Gla .

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What’s the wiring harness for a Mercedes Gla hitch trailer?

Why do we have to connect a wiring harness with the hitch trailer of a Mercedes Gla?

So we will commence our content page by explaining the basics of a wiring harness of a Mercedes Gla. In order to understand how it works, you must already understand its necessity. Whether you have a trailer or a caravan to tow, it is important and above all mandatory by the highway code to respect certain rules, 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 fulfill all the electrical requirements, you will need to install a wiring harness connection on the hitch trailer of your Mercedes Gla . We will look into this in this article, if you want to find out how to install the hitch of a Mercedes Gla, please find out our content page on this topic.

What is the electrical connection of the trailer hitch of a Mercedes Gla?

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

  • The 7-pin electric plug for a Mercedes Gla trailer, 7 pins : This is the classic plug that will be determined on all Mercedes Gla hitches. This electrical connection will allow you to transmit all the lighting functions required for the rear signalling of your trailer, you will find a plug for each function (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 Mercedes Gla: This plug system is specifically used for caravans that involve 12 volts inside to supply the different electrical devices in the cabin. This sort of connection requires 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 Mercedes Gla?

To end this content page, we will quickly explain you how to make the connection of the wiring harness of your Mercedes Gla .

How to make the connection of the wiring harness of an old Mercedes Gla?

To mount the wiring harness of an old Mercedes Gla, you will have to go and get all the necessary cables in the rear lights of this one. We recommend you to call in a car electrician for this intervention because it is difficult, but we will nevertheless summarize the main steps to be accomplished:

  • Remove the trunk lining from your Mercedes Gla 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 Mercedes Gla?

For recent Mercedes Glas, the wiring harness is much easier to connect:

  • You can use a multiplexable box, you will find particular ones for your Mercedes Gla 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.
  • Remove the trunk lining from your Mercedes Gla so that you can route the cables from your box to the front of your Mercedes Gla 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 Mercedes Gla?

Finally, to end this content page we will quickly explain you how to make the electrical connection of a caravan on your Mercedes Gla . To achieve this you will inevitably have to go through one of the previous steps, it’s up to you to select the one that corresponds to your model and your budget. After you have conducted 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 Mercedes Gla, take a look at the Mercedes Gla category.