You can easily test your Tekonsha Voyager Trailer Brake Controller # 39510 by using a circuit tester such as # PTW2993.
First you will want to test that the unit is properly receiving a brake signal from the vehicle. This input signal to the controller is carried on the red wire. Apply the circuit tester (the linked video shows how to use it) to the red wire and press the brake pedal. If you detect a signal on the red wire then you know the controller is receiving its brake signal from... view full answer...
If an item gets returned it will go back to the manufacturer. We do sometimes have to go out to the warehouse and open up stuff to verify contents or answer a customer question.
Since the P3 brake controller is going back and forth telling you a trailer is connected/not connected that indicates a probable short somewhere. The most likely cause is a dirty or corroded trailer connector on the vehicle (we can eliminate the issue being a trailer since you aren't towing a trailer when this... view full answer...
I'd begin by testing the 7-way on the Land Rover. The trailer wiring FAQ I've linked you to will show you which pins on the 7-way will show voltage as each turn signal/brake lamp/ running lamp function is activated. Make sure the 7-way is wired as shown in the FAQ. Then, plug the adapter into the 7-way and test each function. If you don't have a circuit tester, we offer one as part # PTW2993.
Usually when you have both turn signals operating at the same time, it indicates a ground problem.... view full answer...
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