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Recommended Trailer Wiring Harness for 2011 BMW X3 28I

Question:

I am looking for a trailer wiring harness for a 2011 BMW X3 28I. I am not sure whether 119250KIT or 119250KIT is much better or you have other special one ? I will rent RV, not sure 4 way or 7 way wiring now. What adaptor I need? Could you also give a video especially for DIY? I can also buy test circuit pen from you? I already bought a hitch from CT, Reese Towpower 84226 Class III Trailer Hitch, Custom Fit. I am not sure whether it will fit my car, or you have recommended hitch? Thank you!

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Expert Reply:

For your 2011 BMW X3, the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT is a great choice if you don't want to splice into your vehicle wires, but it is more expensive due to the zero contact interface sensors. If it were me, I'd use the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit # 119190KIT confirmed to fit your vehicle and use the quick splice connectors on the factory wires. Both these kits come with the basic circuit tester you referenced.

These give you the basic 4 way trailer connector. If you want to upgrade to the 7-way, then I recommend using the # ETBC7L kit and wireless brake controller # C51180 so no wiring through the firewall is needed.

Your hitch is a confirmed fit and similar to the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 76226 which is a slightly stronger hitch made by the same manufacturer.

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