Whether you need to move house, go on holiday with a caravan, dispose of green waste, or have a hitch is fairly handy. On this page, we will show you the electrical connection of a trailer hitch of a Mercedes Classe B 3 . Obviously, even if the set up procedure is not difficult, it is required to describe some points to consider this work without any problem. First of all, we will see what the electrical wiring harness of your motor vehicle hitch involves, then, in a second step, how to make the electrical connection of the hitch of a Mercedes Classe B 3 .

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What’s the wiring harness for a Mercedes Classe B 3 hitch trailer?

Why do we have to connect a wiring harness with the hitch trailer of a Mercedes Classe B 3?

So we will begin our content page by detailing the fundamentals of a wiring harness of a Mercedes Classe B 3. In order to understand how it works, you must previously understand its necessity. If you have a trailer or a caravan to tow, it is important and above all mandatory by the highway code to respect certain requirements, 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 regulations, you will need to install a wiring harness connection on the hitch trailer of your Mercedes Classe B 3 . We will look into this in this post, if you want to find out how to install the hitch of a Mercedes Classe B 3, please see our content page on this theme.

What is the electrical connection of the trailer hitch of a Mercedes Classe B 3?

We will now fairly quickly show you 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 Mercedes Classe B 3. There are two different systems of electrical connection for a hitch, here they are:

  • The 7-pin electric plug for a Mercedes Classe B 3 trailer, 7 pins : This is the classic plug that will be located on all Mercedes Classe B 3 hitches. This electrical connection will enable 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 Classe B 3: This plug system is principally used for caravans that involve 12 volts inside to supply the different electrical devices in the cabin. This type of connection necessitates 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 motor vehicle is switched on).

How do I hook up the wiring harness of a Mercedes Classe B 3?

To end this content page, we will fairly quickly show you you how to produce the connection of the wiring harness of your Mercedes Classe B 3 .

How to make the connection of the wiring harness of an old Mercedes Classe B 3?

To mount the wiring harness of an old Mercedes Classe B 3, 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:

  • Remove the trunk lining from your Mercedes Classe B 3 to access the rear light unit.
  • Find 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 Classe B 3?

For modern Mercedes Classe B 3s, the wiring harness is much easier to connect:

  • You can use a multiplexable box, you will find particular ones for your Mercedes Classe B 3 and universal models. It’s up to you to choose according to your budget, know that a universal version costs between 30 and 60 euros.
  • Remove the trunk lining from your Mercedes Classe B 3 so that you can route the cables from your box to the front of your Mercedes Classe B 3 and connect them to your fuse box.
  • Install the circumstance in the trunk effectively.
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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 Classe B 3?

Finally, to end this content page we will fairly quickly show you you how to produce the electrical connection of a caravan on your Mercedes Classe B 3 . To do this you will automatically have to go through one of the previous steps, it’s up to you to choose 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.

If you want more tutorials on the Mercedes Classe B 3, go to our Mercedes Classe B 3 category.