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Thread: Auxiliary Switches - Adding A Common Underhood Ground

  1. #1
    Nothing but a Thing doubletapdaddy's Avatar
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    Auxiliary Switches - Adding A Common Underhood Ground

    So I had some lights from my JK that I wanted to move over to my JL, finally allowing me to take advantage of the factory auxiliary switches that came with the tow package on my JLUR.

    More detailed information on the auxiliary switches can be found here:

    https://jlwrangler.com/showthread.ph...LIARY-SWITCHESAttachment 4540
    Last edited by doubletapdaddy; 08-19-2018 at 08:47 PM.

  2. #2
    Nothing but a Thing doubletapdaddy's Avatar
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    Mounted lights awaiting connections:

    20180819_192230-1280x960.jpg

    Aux switch wire bundle tucked next to the battery:

    20180813_184820-1280x960.jpg

    Finally found the orange wire for AUX 3. It was shorter than the rest and was buried under the wrap:

    20180813_191410-1280x960.jpg

    I wanted to use a common underhood ground for the switches without running directly to the battery. I picked up some mechanical lugs from Home Depot as shown below:

    20180819_184809-768x1024.jpg

    20180819_184743-1280x960.jpg

    The lug fit nicely on an unused standoff next to the battery:

    20180819_184727-1280x960.jpg

    20180819_182049-1280x960.jpg

    Testing the lug:

    20180819_184644-1024x768.jpg

    Tinning the ground:

    20180819_185950-1280x960.jpg

    20180819_190432-1280x960.jpg

    Connecting AUX 3:

    20180819_190957-1280x960.jpg

    20180819_191150-1280x960.jpg

    20180819_191325-1280x960.jpg

    20180819_191527-1280x960.jpg

    Tinned ground in mechanical lug:

    20180819_192205-1280x960.jpg

    Testing AUX 3:

    20180819_192742-1280x960.jpg

    20180819_192359-1280x960.jpg

    Covered and time to clean up :

    20180819_193314-1280x960.jpg

    Please note that I have recently moved the lug to a different grounding area per advice of Rhinebeck01 ( see the post directly below). The lug was easy to move and works well for now.

    20180820_072250-1280x960.jpg
    Last edited by doubletapdaddy; 08-20-2018 at 05:33 AM.

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    Nice write up, nice work.. Real nice JL...

    Personally, I would not have grounded where you did. In essence you did ground directly to the battery.

    I would have used here.... see finger pointing to ground point.

    groundpoint by battery.jpg
    Last edited by Rhinebeck01; 08-20-2018 at 05:05 AM.

  4. #4
    Nothing but a Thing doubletapdaddy's Avatar
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    Quote Originally Posted by Rhinebeck01 View Post
    Nice write up, nice work.. Real nice JL...

    Personally, I would not have grounded where you did. In essence you did ground directly to the battery.

    I would have used here.... see finger pointing to ground point.

    groundpoint by battery.jpg
    That is the spot I originally wanted to use but I wasn't sure if I should because it already had a connection there. Can you elaborate on why the spot that you recommend is better than the spot that I used? Thanks in advance.

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    Well, the pic I gave you shows you a known grounding point on the JL/JLU. It is a ground point and no more. It is not linked to the batteries (JL has 2) in any way.

    In regard to where you grounded..

    To kill 12v power coming from the JL/JLU's Main and ESS batteries you need to disconnect as per the picture below. One nut is a 10mm nut and the other two, are 13mm nuts.
    lll.jpg

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    Here is a pic pulled from the Aux install instructions. Instructions call for complete 12v power disconnect to JL and the pic illustrates the two points and you also disconnect main battery negative.
    oooo.JPG

  7. #7
    Nothing but a Thing doubletapdaddy's Avatar
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    Quote Originally Posted by Rhinebeck01 View Post
    Well, the pic I gave you shows you a known grounding point on the JL/JLU. It is a ground point and no more. It is not linked to the batteries (JL has 2) in any way.

    In regard to where you grounded..

    To kill 12v power coming from the JL/JLU's Main and ESS batteries you need to disconnect as per the picture below. One nut is a 10mm nut and the other two, are 13mm nuts.
    lll.jpg
    Thanks for the advice. Originally I was just going to solder a spade on to the end of the ground, however the wire was so small that though that I could not find a spade large enough to appropriately fit the grounding points in the area. Thankfully, the lug was easy enough to move, and I have updated the post above.

    20180820_072250-1280x960.jpg

    Any further constructive criticism from members would be welcomed.
    Last edited by doubletapdaddy; 08-20-2018 at 05:39 AM.

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    Can tell you that you do real clean work. I would not hesitate letting you do 12v wiring on a vehicle of mine. Very apparent that you have a desire, to lets say, do it clean and do it right.

    I like your use of the grounding lug you got from Home Depot. Real solid and clean ground.

    By the way, I did not criticize your work. Just pointed out a little something that will make for a better set-up....

  9. #9
    Nothing but a Thing doubletapdaddy's Avatar
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    Quote Originally Posted by Rhinebeck01 View Post
    Here is a pic pulled from the Aux install instructions. Instructions call for complete 12v power disconnect to JL and the pic illustrates the two points and you also disconnect main battery negative.
    oooo.JPG
    I knew about the disconnect points for the battery, but looked everywhere for recommendations for grounding locations when using the auxiliary switches.

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    For foot well ground point when you use Aux there, you can use this:

    footground.jpg

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