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using 4 pin connector for extra brake light

Discussion in 'Stock 2002 - 2005 Explorers' started by mountaineer2004, May 10, 2019.

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  1. mountaineer2004

    mountaineer2004 Elite Explorer

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    I bought an LED light at walmart. I want to wire it strictly as an extra brake light.

    Can I use the 4 pin connector to power a brake light only?

    I'd rather not splice into the wiring anywhere else.

    Thanks.
     
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  3. Exploring XLT

    Exploring XLT Elite Explorer

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    I see no reason why it wouldn't work.
     
  4. Cary Pebley

    Cary Pebley New Member

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    Yes it will work
     
  5. CDW6212R

    CDW6212R Hauls the mail. Elite Explorer

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    Ditto, that LED should be very low current and only older car, main tail light circuits are usually possible trouble with LED's.

    If you wanted to add something with typical current unlike LED's, then a simple relay would work, with a good power circuit to feed the relay.
     
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  6. mountaineer2004

    mountaineer2004 Elite Explorer

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    Thanks for the help...it's appreciated.
     
  7. TechGuru

    TechGuru Well-Known Member

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    Um, it will blink with the turn signals unless it has some special circuit in it that tells it to only light up when both L and R rights are powered.

    Other wise you'd need to wire it to the 3rd brake light for a brake light only function.
     
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  8. CDW6212R

    CDW6212R Hauls the mail. Elite Explorer

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    I thought this was about using the trailer wire connector below the left tail light area. The brake light circuit(one wire) is also back there, a brown wire I think?
     
    Last edited: May 15, 2019
  9. IPcamper

    IPcamper Elite Explorer

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    On the 4 pin connector, there is a right turn signal, a left turn signal, ground, and a tail light / marker light wires.
    Everything you ever wanted to know about trailer wiring can be found at Trailer Wiring Diagrams | etrailer.com
     
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  10. mountaineer2004

    mountaineer2004 Elite Explorer

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    I don't believe there's a way to hook up brake light ONLY using the 4 pin trailer connection.
    As far as I can tell, it's ground, marker/parking lights, brake/left turn, brake/right turn.

    So if I splice into the 3rd brake light wire, would the LED cause any problem?
    I'm not replacing an incandescent filament bulb, just adding to it.

    Thanks again!
     
  11. TechGuru

    TechGuru Well-Known Member

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    No it would not cause a problem, if it don't light just reverse the polarity.

    While you have the 3rd brake light open I'd take the time to upgrade it to LED.

    6 x T10 Red 6 SMD5630 3W Super Bright 194 168 2825 W5W LED Car Lights Bulb 8809333840039 | eBay
     
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  12. CDW6212R

    CDW6212R Hauls the mail. Elite Explorer

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    I think that should work great, the typical wattage for LED's is trivial versus the loads normally on those circuits.

    Flashers have a hard time dealing with such small loads, they have to sense them and switch them off and on, and most older flashers can't do it.
     
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