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Voltage Fluctuation

Discussion in 'General Electronics Discussion' started by alexanderfoti, Apr 19, 2015.

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  1. alexanderfoti

    alexanderfoti

    24
    0
    Jan 10, 2013
    Hi all

    On my diesel bike, I have a 12v fuel pump (piston type). As its a piston type pump, it causes voltage fluctuations.

    I also have LED brake lights, and it causes big problems with the brake lights flickering. It failed its last MOT on this. I disconnected the fuel pump, it passed, then I re-connected it again.

    This is what it looks like:



    I'm trying to fix it now, and I'm thinking, I can use a constant current driver to sort it out, like this:

    http://www.ebay.co.uk/itm/5A-Constan...item2ed0148934

    Any ideas on what I can use otherwise, something nice and easy like a massive capacitor [​IMG]
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    You probably have a massive capacitor, called a battery. The problem could be voltage drop along the cables. Try connecting the pump directly to the battery.
     
    Arouse1973 likes this.
  3. alexanderfoti

    alexanderfoti

    24
    0
    Jan 10, 2013
    Bingo, hole in one.

    Relay on its way to connect pump directly to the battery. Thanks!
     
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