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Installation Instructions for Trailer Wiring Harness 18252 for a 2008 Smart fortwo  


Is there instructions on installing this wireing?


Expert Reply:

The trailer wiring harness # 18252 is a universal hardwire type of harness so it does not have vehicle specific instructions because it fits so many vehicles. However, the process for installation is the same for all vehicles. You will use the included circuit tester to test each wire behind the tail lights.

The white wire is ground and attaches to a clean bare metal surface. Brown attaches to the running light wire. Yellow is for the left turn signal/left brake light. And green is for the right turn signal/right brake light. I have linked a video that shows the process. This wiring harness is used if the Smart car would be towing a trailer.

If you are going to be flat towing the car behind a motor home then you will need a different wiring harness, like # RM-154. I have included a link to the instructions for you.

Another option is a simple magnetic kit # RM-2120.

expert reply by:
Michael H

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