Yes, it is possible that even though there is a factory 7 way it may not have the power wire connected on your 2015 Mercedes-Benz GLK250. This is common on some vehicles. You are correct that a 12 gauge power wire and circuit breaker is going to have to be ran from the battery to the 7 pole plug in order for the Curt Echo Wireless Trailer Brake Controller - 1 to 2 Axles - Proportional Item # C51180 to work correctly. I recommend the Circuit Breaker - 30 Amp - Perpendicular Mount Bracket... view full answer...
Newer European vehicles use pretty sophisticated wiring systems that require following the installation steps to the letter. For starters, make sure the vehicle is off and the keys are out of the ignition. Then, connect the white ground wire on the Converter to a clean bare metal surface. Once that is complete, you can connect the black wire on the converter to the positive battery terminal. Make sure the fuse isn't inserted when making the attachment to the positive battery terminal, you'll... view full answer...
The plug that plugs into the 12 volt outlet in the vehicle has a small fuse in it. You will need to take apart the plug to get to the fuse. If that fuse is bad, that is the problem. You should be able to find a replacement at a local auto parts store. To check to see if it is the fuse before taking the plug apart, you can try plugging it into another vehicle.
If you replace the fuse and it still does not work or if it does not work on another vehicle, replacement hand held units are available,... view full answer...
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