Results 1 to 6 of 6

Thread: Cigarette Lighter - Switched Power

  1. #1
    Join Date
    Oct 2005
    Location
    Newark
    Posts
    415
    My Cars
    e46 325XI, e36 M3

    Cigarette Lighter - Switched Power

    Hi all- looking to convert my cigarette lighter to switch power since I always leave the phone charger in. I previously had a thread on m3F before it imploded on some recommendations by so electrical pros.

    I know I should run a relay to a switched source like the radio, but can anyone give some guidance and recommendations?

    For example, should I add another fuse somewhere? what type of relay or gauge wiring should be used.

  2. #2
    Join Date
    Nov 2006
    Location
    Columbus, OH
    Posts
    615
    My Cars
    1998 M3/4/5

    Cigarette Lighter - Switched Power

    I installed a dual USB socket in place of the cigarette lighter. Since there is constant power I then installed a small rocker switch in one of the blanks. The cigarette lighter is on a 30-amp fuse which I replaced with a 10-amp fuse. Look up how to wire a 12v switch. No relays or other fuses needed. The cigarette lighter is on its own fuse and circuit.

    Last edited by 82bmw633; 05-27-2020 at 02:26 PM.

  3. #3
    Join Date
    Oct 2005
    Location
    Newark
    Posts
    415
    My Cars
    e46 325XI, e36 M3
    that's a clean looking rocker switch. where did you get it and did you simply intersect the ground (brown) or hot (red) to it?

  4. #4
    Join Date
    Nov 2006
    Location
    Columbus, OH
    Posts
    615
    My Cars
    1998 M3/4/5

    Cigarette Lighter - Switched Power

    I bought the USB and micro rocker switches from Amazon. The USB ground wire goes to ground directly. The power wire for the cigarette lighter goes to one side of the switch. The other terminal of the switch has the power wire from the switch to the USB. I used the existing ground and power wires for the cigarette lighter and added pieces to reach everything. The switch is not grounded.

    Last edited by 82bmw633; 05-27-2020 at 04:33 PM.

  5. #5
    Join Date
    Feb 2010
    Location
    NJ
    Posts
    420
    My Cars
    97 Estoril M3/4/5
    This would definitely be a slower charge, but for a cleaner look you could install a wireless charger.

    https://www.youtube.com/watch?v=LO8Qir7d1Ec

  6. #6
    Join Date
    Aug 2011
    Location
    Vancouver, BC, Canada
    Posts
    700
    My Cars
    99 M3 Vert
    If your car came pre-wired for the carphone, you could splice into that set of wires, it's right under the centre console which makes it very convenient.

Similar Threads

  1. Cigarette Lighter socket, power is always remains on
    By Minimalsix in forum 1991 - 1999 (E36)
    Replies: 17
    Last Post: 05-05-2010, 12:00 AM
  2. Cigarette Lighter /DC power replacement
    By orbbb in forum 1999 - 2006 (E46)
    Replies: 0
    Last Post: 05-05-2008, 02:27 PM
  3. cigarette lighter 12v power
    By Xiphos in forum 1992 - 1999 M3 (E36)
    Replies: 2
    Last Post: 12-22-2007, 03:01 PM
  4. Cigarette lighter = no power
    By Shadow86325e in forum 1983 - 1991 (E30)
    Replies: 13
    Last Post: 10-13-2007, 06:04 PM
  5. Cigarette lighter, no power!?
    By Nillaice in forum 1991 - 1999 (E36)
    Replies: 4
    Last Post: 12-29-2004, 06:10 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •