I would be happy to help you find the right trailer wiring for your 2019 Mercedes-Benz Metris. Since there are no custom wiring kits you will need a universal kit like the ZCI Circuit Protected Vehicle Wiring Harness # 19250KIT. This harness uses zero-contact interface sensors that clamp onto the wires, so no splicing is required. This 4-way wiring harness will work great for your vehicle.
If you are looking for a 7-way then in addition to the 4-way you will need the Universal Installation... view full answer...
I have a solution for you to hard-wire in your Tekonsha P3 # 90195 to your 2020 Mercedes-Benz Metris, but there is not a plug and play adapter that can be used. If you want to hard-wire a brake controller then you'll want to use the Replacement Brake Control Plug-In Harness for Tekonsha and Draw-Tite Brake Controller 12" Long # 20127, which will plug into your P3 and gives you the loose wires needed to connect to the wires on your vehicle. You may need a circuit tester like the # PTW2993... view full answer...
It sounds like you already have a 4-way on your 2017 Mercedes-Benz Metris. If you don't, you will need to start by adding one with the # C59496. From there, you can upgrade to a 7-way using the # ETBC7.
We have had great success with the # ETBC7. If you take a look at the product page it has thousands of reviews and we have over one hundred installation videos. This is the perfect solution for adding a 7-way when a custom wiring option is not available. This comes with the adapter, wiring,... view full answer...
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