We have not yet had the opportunity to install the Curt Trailer Hitch Receiver # C55WR on a 2021 Mercedes-Benz GLA. This hitch does have a bolt-on installation, and the heat shield must be modified or trimmed. Although we do not yet have an installation video, I have attached the written instructions for your reference. view full answer...
The Curt # C13197 Class III hitch is a confirmed fit of all 2015 models of the Mercedes-Benz GLA.
I don't have any specific installer recommendations other than our staff at our facility in Wentzville MO, but I'd recommend using a reputable body shop in your area to do the install for you. As you can see in the video I've linked for you, the installation is pretty extensive, involving temporarily removing the rear bumper and fascia as well as the taillight assemblies. A body shop would... view full answer...
The ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT is a universal wiring harness and will work with a 2-wire, 3-wire, PWM, and multiplex wiring systems.
With that being said, I went ahead and checked the instructions and the input wire used should be yellow to left turn/brake, green to right turn/brake, and brown to vehicle tail wire. view full answer...
I do strongly recommend running a separate power wire from the # C59496 directly to the vehicle battery. A wiring harness must have its own dedicated circuit directly to the battery since the 12 volt accessory circuit was not designed to support the additional load of a trailer wiring harness. We have seen many instances where customers have tapped into a 12 volt accessory circuit, like a 12v power supply at the rear of the vehicle, and the harness failed. We have also seen instances where... view full answer...
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