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Mod to get 3157 bulbs working in 3157CK base

Discussion in 'Lighting' started by makanouchi, May 15, 2016.

  1. May 15, 2016 at 8:53 PM
    #1
    makanouchi

    makanouchi [OP] Well-Known Member

    Joined:
    Jun 21, 2015
    Member:
    #157894
    Messages:
    179
    Gender:
    Male
    First Name:
    Lac
    Austin, TX
    Vehicle:
    2015 MGM Double Cab Long Bed
    Front Grill, Audio System, Seat covers, Rear bumper, hood struts, Projector Retrofit, Led's throughout. Avid Bumper Guard, Avid Sliders, Bilstein 5100 front and Rear, OME 885, AAL.
    My 2015 tacoma has 4157NA bulbs for the DRL/Signal. That bulb is the same as 3157CK. There's plenty of aftermarket LED bubls for 3157 but almost none for 3157CK. Here's what I did to get them working.
    Difference btw the two sockets:
    http://www.distantxtremes.com/blog/3157-vs-3157ck-what-is-the-difference
    http://www.autolumination.com/conversion.html

    On your DRL/Signal socket, if you swap the cables between ground and Signal. Driver's side, swap the yellow and white cable, Passenger side, swap the blue and white cable. Green on both sides is the parking light. The layout becomes this:

    ground -
    - Signal

    Park -
    - Signal

    On the bulb, you'll have to remove the top Signal lead next to the ground, otherwise there will be a short. The bulb shares the same ground internally so it is not needed. I simply bent the lead back and forth a few times to snap it off the bulb. I used a 9v battery to confirm which leads were ground and signal, tested and confirmed a few times before breaking off the lead. This leaves you with:

    ground -



    park -
    - Signal

    Tested in my truck with JDM super bright led bulbs from Amazon http://www.amazon.com/JDM-ASTAR-Ext...&redirect=true&ref_=oh_aui_detailpage_o09_s00 and they works perfect. Signal works, parking light works. I have done the DRL removal mod so I cannot confirm if that works but I don't see why not since the DRL is just the turn signal staying on. I disabled because I'm using load resisters on the turn signal to fix hyper flashing and having DRL on would keep the load resistors on all the time and probably melt something. Sorry for no pictures, hope this makes sense. Hit me up for any questions, I did a lot of searching and I don't think this has been done yet.
     
  2. May 15, 2016 at 8:59 PM
    #2
    makanouchi

    makanouchi [OP] Well-Known Member

    Joined:
    Jun 21, 2015
    Member:
    #157894
    Messages:
    179
    Gender:
    Male
    First Name:
    Lac
    Austin, TX
    Vehicle:
    2015 MGM Double Cab Long Bed
    Front Grill, Audio System, Seat covers, Rear bumper, hood struts, Projector Retrofit, Led's throughout. Avid Bumper Guard, Avid Sliders, Bilstein 5100 front and Rear, OME 885, AAL.

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