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  • 3rd Battery

    Gday

    can anyone help? Just put a 3rd battery in my 150 Kakadu D4D. Alternator is fine as its been checked by a toyota Mechanic. Just wondering if the alternator charges full time or just when it senses a load on the battery? If it doesn't charge full time is there an option to rectify this?

    cheers

  • #2
    While the engine is running the alternator is supplying charge, just how much three batteries might need is another question though.

    If no. 2 and no.3 are auxillary and both are in a low state of charge they'll possibly be looking for more amperage than is available.

    If you can supply more detail of your set-up (battery types and locations/ method of charge DCDC or isolator etc) I'm sure a more detailed answer will be provided by the PP brains trust!
    Cheers
    Micheal.

    2008 GXL D4D Auto. GOING... GOING... GONE
    2015 GXL 1GD Auto. And it begins again...

    Comment


    • #3
      Well I am definitely not part of the PP brains trust but curious as to why you need three batteries, will the two auxiliary just be paralleled together for more capacity?
      I have only the standard one battery on my GXL, having not needed any extra yet so I have no idea of what is involved in fitting extras. I have noticed from techstream that the battery voltage on my Prado is only 13.6/13.7 in normal use. I think (but do not know) that this is on the low side of what vehicle batteries float at? this doesn't help much if you use a diode splitter as they would reduce voltage more from a not very high starting point, so perhaps this is why I have read people recommending a DC-DC converter?
      I have plenty of experience fitting auxiliary batteries to marine engines, I always take the simplest way out which is to weld up a bracket and fit an extra alternator, I presume there just isn't room for this in a Prado?

      Comment


      • #4
        Don't know a heck of a lot about the topic, but this is probably not a bad place to have a look, gives options on what sort of product they advise for the type of battery and capacity that you intend to fit: https://www.redarc.com.au/dual-battery-selector

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        • #5
          I have been RedArc products in my prado but wouldn't rely too much on their dual battery page, you'll find that in almost every dual battery set-up they'll tell you that you need a DC Charger!

          John I also see 13.6 - 13.9 in my prado and am having no trouble charging my Optima Yellow Top. Not sure what other deep cycle batteries need but it doesn't need a DCDC for Optimas.
          Cheers
          Micheal.

          2008 GXL D4D Auto. GOING... GOING... GONE
          2015 GXL 1GD Auto. And it begins again...

          Comment


          • #6
            The 2010 Prado alternator charges all the time, ie it will try and maintain its float voltage at all times regardless of the load on the alternator.
            If you wish to improve the charge voltage fitting a booster diode will give a much improved charge voltage.

            HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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            • #7
              My aux battery which is only 75 ah because of the available room in the engine bay. I had a great response with installing the booster diode. I've since added a 3rd battery 130ah in the rear. I'm tossing up whether to upgrade the alternator to get extra current out of so as to charge quicker since the car sometimes doesn't get started for a day or two. Have a fridge in the back all the time. Has anyone installed an aftermarket alternator?

              Comment


              • #8
                150W+ of solar panel on the roof will help immensely if the car is in the sun.
                My 150 build - http://www.pradopoint.com/showthread.php?27423-A-Random-approach-to-a-Bluestorm-150-GXL-D4D-automatic

                Comment

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