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    Thread: DIY/FAQ: Adding Additional 12v Power (Cigarette Lighter) Plug in Rear Hatch / Trunk

    1. Global Moderator BHB's Avatar
      Join Date
      Oct 26th, 2004
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      Southern California
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      28,950
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      '11 Grand Cherokee
      06-22-2009 10:05 PM #1
      This DIY/FAQ is for the installation of an additional 12v Power Plug in the trunk/hatch of a GTI/Rabbit.
      As always, any work you do on your car is at your own risk. Myself, and this website cannot be help accountable for anything that goes wrong while working on your car. Please undertake at your own risk.
      Tools Needed:
      Wire Cutters
      extra 12v Plug, with wire leads (available from Radio Shack for under $10.)
      Soldering Gun / Solder (if you'd like)
      Wire Caps
      Electrical Tape
      Steps
      1) Follow my DIY for removal of the interior trim here: DIY/FAQ: Trunk / Hatch Interior Trim [Partial] Removal
      2) As always, when working with automotive electrical, you'll want to check the current of what you're working on. The 12V plugs in the Mk5 are ignition switched, so if the car is off, you should be okay. You can remove the fuse and/or disconnect the battery if you'd like as well.

      3) Cut the wire behind the harness. Strip the wires. Red+Black is hot, brown is the ground.

      4) Splice in your new 12v Plug.

      5) I used wire caps to splice the wires. I could have (maybe should have) soldered them together, but this seemed to work fine for my purposes. You can see here, the 12v plug I bought from Radio Shack is fused at 10a.

      6) Here is the "somewhat" finished project:

      7) Check your connections, to make sure everything was spliced correctly.

      8) Put everything back together. There is ample room behind the trim for the additional plug. You'll notice I've also plugged in the accessory's 12v plug, and electrical taped the connections.

      9) In case you're interested, here is what the extra plug is powering:
      Current: 2011 Jeep Grand Cherokee 5.7 Hemi 4x4, 2013 BMW 650GS Sertao, BMW 1150RT
      Gone: 2010 Audi S4; 2008 GTI; 2007 Audi A6; 2004 Audi allroad 2.7T; 2001 Audi A6 2.7T; 1999.5 Mk4 Jetta VR6; 1991 Jeep Cherokee 4.0 4x4

    2. Member ywang98's Avatar
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      Jul 11th, 2000
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      SoCal, Orange County
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      R32-4230
      06-23-2009 12:20 PM #2
      Just wanted to point out that additional fuse on the new socket is almost pointless.
      Total current draw of the two sockets will still be limited by the fuse in the fuse box (since you are splicing from the original socket).


      Modified by ywang98 at 9:21 AM 6-23-2009

    3. Global Moderator BHB's Avatar
      Join Date
      Oct 26th, 2004
      Location
      Southern California
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      28,950
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      '11 Grand Cherokee
      06-23-2009 08:37 PM #3
      I went ahead and did it over today, same setup, but using butt splices and heat shrink. I feel more comfortable with this setup.
      Current: 2011 Jeep Grand Cherokee 5.7 Hemi 4x4, 2013 BMW 650GS Sertao, BMW 1150RT
      Gone: 2010 Audi S4; 2008 GTI; 2007 Audi A6; 2004 Audi allroad 2.7T; 2001 Audi A6 2.7T; 1999.5 Mk4 Jetta VR6; 1991 Jeep Cherokee 4.0 4x4

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