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rhudson is very much correct. This is NOT right at all and should by no means be considered "normal" under any circumstance. There are many different types of brake controllers and connections for each one are specific to each unit. Some vehicles are equipped with two switches, one only for the brake lights which is usually found behind the pedal arm under the dash. The other swicth can be found on vehicles pre-wired for trailers with electric brakes and some with a secondary hydraulic switch that gives feed back to the anti-lock system and or vehicle computer. The vehicle electrical system also needs to be looked at as well. If you have an interconnection between the brake light swicth and the 4 way flasher system, there is possibly a problem. It is normal for the brake light switch on the pedal to stop the 4 ways from flashing, this is done to show that you are applying the brakes and slowing, a safety overide of sorts. The trailer brakes should only function when the pedal is depressed and should not function when turn signals or 4 ways are activated. As someone else said, you may have a bad ground from the trailer to the vehicle but if this is the case, you should also notice other lights besides the 4 ways flashing or all the lights flashing as the current will flow in all devices according to ohms law. I have to side with rhudson and say that something is not connected properly either in the controller or wiring to the trailer or on the trailer itself. What you need to do is start isolating the problem first starting at the wiring connected to the brake controller. To do this you will need a complete wiring diagram of the controller. If this is a U-haul installed system, you need to return it to them to get repaired as it is unsafe to use as it is. If the U-haul shop you talked to refuses to repair the problem, take it to another dealer even if you have to go out of your way. If you still don't get the problem fixed, call U-haul main office, number is on their web site. If you still don't get results, take it to a professional garage that does electric trailer brakes and have it fixed. Be sure to document everything including the dates, times and names of everyone you talked to at U-haul. This will be necessary when you file the legal suit against them. In addition to getting your money back for the repairs, you also need to file a formal complaint against U-haul with your state D.O.T. (Department of Transportation). U-haul is not the best company to deal with at times and you should expect to end up in a battle over this so keep everything in order and don't be afraid to mention the fact that you are willing to seek legal action if they don't fix it NOW! I've been around the block a time or 10 with people bringing U-haul stuff into my shop to be fixed and it ain't no fun. Good luck on this and don't use it till you have it fixed properly.
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