TRAILER LIGHTS REMAINING ON AFTER 2010 SUBARU FORESTER HAS BEEN SHUT OFF

Question:

I installed one of these almost 10 years ago. Order Number: 101075418. Recently the trailer lights have remained on when the car is off. Several trailers do the same thing. Any ideas? Is the wiring harness just shot after many years? Thanks, Rob

asked by: Rob U

Expert Reply:

It sounds like the converter box is not stopping the power coming from the vehicle to the trailer. I suggest checking your trailer wiring on any of the trailers you have connected wiring to before you pull them again. Bad trailer wiring is typically what will cause the malfunction.

A wiring problem on one of the trailers has likely caused the converter box to short out. The converter box did what it was supposed to do by preventing back feed to the vehicle wiring. The short has allowed the power from the vehicle to jump over a circuit inside the converter box which is causing the trailer light to remain on after the vehicle is off.

Unfortunately these products are not serviceable, so I recommend replacing it with the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118467

expert reply by: Shane H