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Battery charging issues and a fix??

Discussion in 'LR4' started by djkaosone, Nov 16, 2019.

  1. djkaosone

    djkaosone '11 LR4 HSE LUX 5.0L V8

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    Ok, I've been battling battery issues for quite some time. If you don't know, I'm on my 4th battery.

    This time I got a Duracell Platinum AGM H8 850CCA 92Ah. I decided to change the battery type with my IIDTool in the CCF settings under Body Control and Battery type.

    I seriously tried all of them and ran through the battery reset too. Each time, the truck would fire up and start at 13.8V and then drop to 12.0V-12.8V. I left the setting in the CCF at H8HD 900CCA and drove 25 miles and the whole time the it read 12.0V-12.5V.

    I even emailed Pat at GAP Diagnostics and he pretty much said that I'm SOL and indirectly pointed to go back to a flood battery.

    Long story short, if you have these issues or go to an AGM battery this is how I fixed my issue and now it reads a full 14.xV. While the truck is running, remove the plug connected to the BMS on the negative cable, wait 10 seconds, plug it back in, and check voltage. Worked for me and now I'm getting 14.5V. I'm assuming the BMS reset from the IIDTool helps it relearn the Amp draw and tries to recalibrate the alternator's output to charge the battery, but by removing/reseating the BMS sensor cable it interrupts the signal and ultimately resets change in signal. That's just my guess.

    Hopefully this helps someone with battery issues. I just did this and I'll update this after a week or so.
     
  2. avslash

    avslash Full Access Member

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    Will be interested to see if it stays there. Mine seems to jump up to that range after any kind of "event" like vehicle reset, sensor removal, etc, but it always seems to find its way back down after a week or so.

    Looking forward to update.
     
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  3. Robuk

    Robuk Active Member

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    Just disconnect the sensor and leave it disconnected, you will then get around 14.2 volts dropping to around 13.8 lowest, by disconnecting the sensor smart charging is disabled, you now have a standard continuous regime. I have been running my Merc for over a year with this sensor disconnected, it has also been disconnected on my Porsche, should work on Land rovers. I did it to get rid of stop/start.

     
  4. 930dreamer

    930dreamer New Member

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    djkaosone - was this a permanent fix or did it eventually settle back to 12.x V?

    also, do you have a picture of the BMS plug?
     
  5. avslash

    avslash Full Access Member

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    It will always settle back eventually.

    best ideas I've heard so far are to rig a disconnect switch somewhere inside the cabin so you can flip it every now and then to get back to a full charge, or have someone figure out what the output of the sensor is that drives it to 14 ish volts and a modify the sensor electrically to only present that feedback to the ECM.
     
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