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Can Power Wire for 2016 Porsche Cayenne Trailer Wiring Harness be Attached to 12 Volt Outlet

Question:

Instead of running the power wire for the unit from the rear of the vehicle all the way to the front battery connection, would it be acceptable to tap into the 12V power socket cigarette lighter type at the rear of the vehicle? From what I can tell, the circuit for these sockets is rated at 20A. I would still include the 15A fuse. Thanks for your help!

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Expert Reply:

We get this question a lot so I know where you're coming from. But trailer wiring harness manufacturers design the powered converters such as # 119250KIT so that they draw 12-volt power directly from the vehicle battery for a very good reason. Doing so keeps the vehicle wiring fully isolated from the wiring of the trailer.

Short circuits in trailer wiring are very common, keeping the trailer wiring isolated from the vehicle will help prevent the wiring in your 2016 Porsche Cayenne from being damaged if a short circuit occurs in the wiring on the trailer. Trailer wiring is easy and inexpensive to repair, so is replacing a trailer wiring harness. The same can't be said for the factory wiring of your vehicle.

I have linked a help article with tips on routing the power wire for you.

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