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"Low" Battery Volts when driving

Discussion in 'General Land Rover Forum' started by bankz5152, Sep 30, 2020.

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  1. bankz5152

    bankz5152 Well-Known Member

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    Could just be me being a tad paranoid but ive noticed my main battery is showing fairly low. Usually around 13v when driving, heated screen/seats etc... drops down to ~12.8 or so.

    Showing 12.4v when stationary

    Aux battery is showing 13.84v when running 12.45 stationary.

    Main battery is about 2 years old, maybe 3.

    Could the alternator (original) be on the way out?

    Cheers
    Josh
     
  2. Si Click

    Si Click Well-Known Member

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    Doesn't sound too bad to me. Does it go as high as 14V just after start, if so then the alternator is probably fine.
    If you are worried about the battery you can buy battery testers quite cheaply. I have one from Foxwell that works well. You connect it, tell it the type of battery and the CCA it is supposed to have and it will give you the state of charge, the state of health as a % and a clear statement of advice as to whether to change it.
     
  3. bankz5152

    bankz5152 Well-Known Member

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    Of course, didnt think of that :oops::oops::oops::rolleyes:

    Just being dim....

    But no doesnt go above 14v
     
  4. Si Click

    Si Click Well-Known Member

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    A healthy alternator should be able to deliver a little over 14V to a battery that has just had a big discharge - starting the engine. Your alternator might be a bit tired, but it could easily work perfectly well for a few years yet. Worth checking it though.
     
    bankz5152 likes this.
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