Can 12V Accessory Power Outlet Be Used to Install Powered Trailer Wiring Harness

Updated 04/29/2015 | Published 04/28/2015

Question:

Hi - instead of running the power lead under the car to the battery, can I splice into an existing circuit in the back there is one used for a 12v outlet. Thanks,

asked by: Jim

Expert Reply:

A 12-volt accessory power outlet such as that on your 2015 Volkswagen Golf is not suitable for installing a trailer wiring harness. It is intended for use with low-current-demand non-critical accessory items like emergency lights, phone chargers, etc.

The power for an active trailer wiring harness like the Curt # C59236 needs to come directly from the battery.

Most importantly, using the outlet would negate the benefit of using a powered converter whose key purpose is to isolate your car's wiring from any potential faults, shorts or overloads from the trailer wiring. Also there is always the risk of that connector becoming dislodged which would kill your trailer lights without you knowing it.

Running that power wire is not too difficult but we do have an article that offers plenty of guidance; this is linked for you.

expert reply by: Adam R