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Thread: Charging or not ?

  1. #1
    Low Bitrate MOnline's Avatar
    Join Date
    Apr 2007
    Holland, Poeldijk (Near The Hague)

    Charging or not ?

    Hi all,

    Well I am not a real hardware expert (i know my way around but thats it). My car has some problems charging its battery and I just want to see if its charging. I added a nice voltage meter to my car and I can see how much voltage my battery is producing. I want to have a light that turns on when my voltage is over 13V (because if it is it is charging else its only draining ). So how would I do this is there some sort of relay available or what.

    With kind regards,


  2. #2
    Low Bitrate ajscomp372's Avatar
    Join Date
    Mar 2006
    Buffalo, NY
    I think the best way to be able to do what you want would be to hook up an ammeter between the battery and the car (it would have to be a really high rated ammeter though). This way (if the in was connected to the battery and the out was connected to the car) the ammeter would show positive current if the battery was being discharged, and negative current if it was being charged.

  3. #3
    Join Date
    Feb 2008
    Perth, West Australia
    Unless your alternator is stuffed(or your battery is really stuffed), it should be over 13V, ie. about 14.5V while driving.

    Just buy/borrow a clamp meter and just put it over you main battery line to gauge whether its charging enough.

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