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Hello. If you have a factory ford trailer hitch and harness the ford blind spot detection system should automatically turn off when it detects that you are towing a trailer. If you do not, you will have to manually shut off the system otherwise it will turn on the indicator because it cannot determine that it is a trailer you are towing or a vehicle following closely. This is why the indicator turns on then you are turning especially. This is a normal condition for the vehicle.
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