I'd like to piggyback on CapeBuild's thread, as I've run into a problem. I have a 2022 F350 with a 4-way plug to my camper. All my trailer lights worked until I went to hook up my Third Brake Light. I realized that since a single signal combined each turn signal with its stop light, I would have to split the signals out. I initially purchased a Red Wolf 2-wire-to-3-wire converter, and hooked it up per these directions from etrailer.com:
![171338](http://tnttt.com/gallery/image.php?mode=thumbnail&image_id=171338)
Although my "low" taillights worked as before, incl blinkers and brake lights...that's only when the brakes were not applied. When the brakes are pressed, the converter buzzes for as long as the brakes are on. When a turn signal is activated in conjunction with the brake being applied, the Third Brake light flashes in time with the turn signal....and the opposite turn signal is activated! If turn signals are not activated and the brake is pressed, the Third Brake Light (and low taillights) all work, but the relay still buzzes.
Because of the buzzing, I thought perhaps I had bought a defective converter unit. I then bought a Curt model....same result. My friend said I should connect it per the "vehicle side" instructions that were the same for Red Wolf and Curt:
![171339](http://tnttt.com/gallery/image.php?mode=thumbnail&image_id=171339)
In the initial setup, the converter was simply used to extract the brake signal, and not send the turn signals to the Third Brake Light. In the second setup, obviously, it all goes through the converter. However, that approach failed, too.
I have a friend with an older Dodge Ram, and the relay does not buzz when my camper 4-way is connected and brakes applied, but it still doesn't work correctly. However, there must be some difference between Ford and Dodge wiring.
I don't know what to do next....google hasn't been a lot of help, though I did find a diagram that showed a diode in-line.....any ideas?
Mike