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12vDC Issues

Discussion in 'General Electronics Discussion' started by DMS11X, Sep 16, 2015.

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  1. DMS11X

    DMS11X

    1
    0
    Sep 15, 2015
    12vDC Truck Backup Camera

    Wont turn on with 12.45vDC from my truck, or 14.4vDC when engine running... But when I plug the camera into a 12vDC 1.5A transformer from 120vAC, it does turn on.

    I am miffed. I was thinking about adding a diode to the positive side of the 12v connection...

    Any thoughts guys and gals?



    Wired:
    Stereo Aux 12v out to a relay--> at the relay I provided 12v from battery---from the relay---> to both the video monitor and the camera. Yes the monitor works, and to reiterate, the camera does not work from vehicles power but does work from 12vDC transformer from 120vAC, and YES I double checked the polarity.
     
  2. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
    Measure the ACTUAL voltage from your 12v DC supply
     
  3. Tha fios agaibh

    Tha fios agaibh

    2,099
    708
    Aug 11, 2014
    And measure it, with the camera hooked to the vehicle.

    It's possible to have a loose connection that shows a 12v reading on a meter, but will die off (open) once a load is applied.
     
  4. Old Steve

    Old Steve

    734
    169
    Jul 23, 2015
    And double-check that the relay is actually switching.
     
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