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LEDs tapped into 7pin=problems

Discussion in 'Automotive Electronics' started by NickB1980, Jan 2, 2016.

  1. NickB1980

    NickB1980 New Member

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    Happy New Years everyone...
    I just wired up some LED brake and turn signals to the 7 pin harness on my 2015 F150. Doing so makes my truck think that I have a trailer connected which disables blind spot monitoring, cross traffic alerts and the rear park assist. Does anyone have an idea of how I can wire up these lights w/o making the truck think I have a trailer hooked up? I tried popping out a taillight to tap wires but the wiring is such a thin gauge compared to incandescent lights. Any help would be great.
     
  2. Tony Stewart

    Tony Stewart Well-Known Member Most Helpful Member

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    Is there also a 4 pin port? It may not have the same current sensing reactions, as the 7 pin unit which also has trailer brake power option.

    contact dealer for info on load current threshold for this effect.??
    replace bulbs with LEDs if this helps reduce load.
     
  3. NickB1980

    NickB1980 New Member

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    There is a 4 pin port which shares the same wiring from the 7 pin.
     
  4. dave

    Dave New Member

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  5. Diver300

    Diver300 Well-Known Member

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    The F150 will detect any current above about 10 mA as a trailer. They are made that sensitive because many trailers have LED lights.

    You will need to have some sort of amplifier circuit that will take much less than 10 mA, and switch on the lamps. I suggest something like this:-

    http://www.hitchesforless.com/modulite.htm

    You could wire the inputs up to either the car's tail light or the trailer socket. Either way, you need a power feed, and the module should take so little current that the circuit connected to is not affected.
     
  6. NickB1980

    NickB1980 New Member

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    Brilliant! So which exact module should I order for this application? Here is a link to the LEDs installed in my headache rack.

    http://www.amazon.com/gp/aw/d/B00M9..._SY170_QL70&keywords=recreation+pro+led&psc=1

    I imagine that I would run a power line from the battery into the module, tap the module into the 7 pin wires then tap the wires from the LEDs into the module...Correct?

    Thanks again for the guidance. I never would have figured that one out.
     
    Last edited: Jan 8, 2016
  7. Diver300

    Diver300 Well-Known Member

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    I would suggest this:-
    https://www.etrailer.com/Wiring/Curt/56146.html

    Instructions are at https://www.curtmfg.com/masterlibrary/56146/installsheet/CME_56146_INS.PDF

    You should connect the stop input to ground, then just connect as you said. Power from battery (via fuse), connect the module wires to the 7 pin wires, and connect your LED lights to the 4 pin socket that comes connected to the module. You might end up cutting off the 4 pin socket and wiring direct.

    You could wire that same module to the car's tail lights instead. If your car has separate stop lights, you will need to connect the stop input of the module to them if your extra LED lights are to come on as stop lights as well as turn signals.
     
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  8. NickB1980

    NickB1980 New Member

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    Thank you for your help kind Sir.
     

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