12VDC motor control circuit

Discussion in 'Automotive Electronics' started by BamaFan, Sep 2, 2016.

  1. BamaFan

    Thread Starter New Member

    Sep 2, 2016
    6
    1
    I want to control a 12VDC motor from two separate places in my motorhome using toggle switches. This motor drives an air compressor which I want turn on or off, either from outside the coach or from inside. How can I do this?
     
  2. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    Use two two-way switches (single pole double throw, SPDT) as below except using your 12V instead of the mains. Then whatever the state of the motor either switch will change it.
    [​IMG]
     
  3. ian field

    Distinguished Member

    Oct 27, 2012
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    Unless you want it to be a reversing switch - you need to put the motor and battery in series.
     
  4. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    Oops! Very true. So it should look more like this (motor = lamp!).
    [​IMG]
     
  5. BamaFan

    Thread Starter New Member

    Sep 2, 2016
    6
    1
    Ah - of course. A simple three-way switch. Duh! Thanks for waking me up Albert.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Two way/three way, depends on your country of origin!;)
    Max.
     
  7. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    Does it? How does that work then?
    Is it like where is the first floor in a building?
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    N.A. 3 way, UK 2 way. Same thing.
    To me the 2 way makes more sense.
    Max.
     
  9. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    I learn something new every day :)
     
  10. MaxHeadRoom

    Expert

    Jul 18, 2013
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    And....More than 2 switches, N.A. 4 way, UK Intermediate switch.
    Max.
     
  11. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    "America and England are two nations divided by a common language." -Winston Churchill.
     
  12. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I always thought it was George B. Shaw?
    Max.
     
  13. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    Eventually we learn the nuances: e.g. bits, boot, bonnet, 2-way/3-way etc. So that's why country is important.
     
  14. ian field

    Distinguished Member

    Oct 27, 2012
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    His reversing switch could also provide off state braking by shorting the motor in any position other than run.
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
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