D4: Low Battery Warning - "Please start vehicle" with CTEK





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  1. #1
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    Default D4: Low Battery Warning - "Please start vehicle" with CTEK

    So I bought a CTEK.....something I swore never to do.

    Reason I bought it is the D4 is parked 90% of the time and is only used for trips. Also my old R600 cheapie, no name brand charger has a fan on it which i was worried will burn out if run for weeks on end.

    Anyway, when the CTEK is connected I get a low battery warning on the dash asking me to start vehicle even with the voltage in the battery being correct. I never get this with the cheap no name brand charger. If I drive the vehicle for 1 or 2 kms after getting this warning and then leave the charger unplugged i dont get this low battery warning.

    Ive left the battery disconnected from the CTEK charger for longer than a week and even then I dont get this warning. The battery has been checked and even after a week its sitting in the high 12v's.

    As soon as I connect the CTEK charger again I get the warning on the dash even if the battery is not showing low voltage .

    The CTEK is a CTEK MXS 5.0 eight stage charger, 12V 5A

    Anyone have any ideas?

    Thank you
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by BruceT View Post

    Anyone have any ideas?

    Thank you
    1) you should drive the D4 more
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    How are you connecting the charger to the vehicle?

  4. #4
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by Tombie View Post
    How are you connecting the charger to the vehicle?

    Direct to the battery


    LOL @ Jelo
    Question about chargers and a battery and it becomes a crank issue. True to form bud....... haha
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  6. #5
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    I've read somewhere (think it was in the Disco manual actually...) that the correct way of charging the Disco's battery with a charger is to connect the positive to the "+" terminal on the battery and to connect the negative terminal NOT to the battery but rather any "grounded point".


    Not sure this will actually make any difference though.....

    I also have a CTek and my D4 have never given this message when connected to CTek.



    PS...sure George will be here asap.
    Last edited by Regard; 2016/09/16 at 08:37 AM.

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Exactly "Regard"..

    The D3/4/RRS has a device in the -Ve lead which the vehicle uses to sense condition and regulate its energy.

    ANY device connected into one of these vehicles can take + from the battery, however the - MUST be connected to one of the plethora of Earth points on the vehicle NOT directly to the battery -.

  8. #7
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Mine not a D4 but D3, and it is connected to my small Ctek (800ma) one for 5 days a week and then I drive on weekends and I have never had any error message displaying. My Ctek is connected directly to the positive and negative terminals on the battery.

    I wonder if the Ctek isn't faulty.

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Also, there was a software update for the charging system to prevent a known error.

    What year is the vehicle and has it had the update?

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    my kids have a camper thing, it has a huge c teck thing in it. i plug in the camper use jumper cables from the camper battery and connect it to my d4 battery and walk away, never had a problem, the light on the camper thing go down a few lights then go back to the top green one after leaving it connected.
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Being across the water - are your D4s delivered with the 12N and 12S trailer plugs?
    If not what type?

    I have a charging lead I made up that allows me to connect the Ctek to the trailer plug..
    Much cleaner and easier than having the bonnet up etc.

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Doesn't the D4's have both 12? and 12S plugs? What is the difference between the black and white plug?

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    The reason why chargers and jump starting uses a ground on the chassis is to avoid a spark close to the battery where flammable gasses may be.

    The low voltage may be due to the charger "loading" the battery to test it's condition before running a charging map.

    If it's easy to get to, just undo one of the poles and leave the charger straight on the battery.

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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Thanks Regard and all. I will try connect as suggested and see if the fault continues.
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by BruceT View Post
    LOL @ Jelo
    Question about chargers and a battery and it becomes a crank issue. True to form bud....... haha
    I only need a SMALL gap

    Like SFA.
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by MariusFourie View Post
    The reason why chargers and jump starting uses a ground on the chassis is to avoid a spark close to the battery where flammable gasses may be.

    The low voltage may be due to the charger "loading" the battery to test it's condition before running a charging map.

    If it's easy to get to, just undo one of the poles and leave the charger straight on the battery.

    That makes sense (the loading of the battery) but why do i still get the low voltage error after it being on charge for a week plus? Surely it should have completed the charging map?

    Wont be able to lock the vehicle with the battery disconnected.
    BruceT
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by Tombie View Post
    I have a charging lead I made up that allows me to connect the Ctek to the trailer plug..
    Much cleaner and easier than having the bonnet up etc.
    Txs, you just gave me a great idea. I am gonna fit a Brad Harrison adaptor to my battery charger, and simply plug it into the BH plug on rear of my Disco which is connected straight to the battery anyway. No need to open the bonnet and battery cover anymore. BTW, ive got a D2, not a D4.
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  20. #17
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by TwinDisco View Post
    Txs, you just gave me a great idea. I am gonna fit a Brad Harrison adaptor to my battery charger, and simply plug it into the BH plug on rear of my Disco which is connected straight to the battery anyway. No need to open the bonnet and battery cover anymore. BTW, ive got a D2, not a D4.

    Thats what I used to do with my cheapie charger. Also do the same when using solar power.

    Some replies I got on Disco3 for future reference:

    Dudleydisco wrote:
    If you use the -ve terminal of the battery rather than a chassis ground, then the BMS doesn't register the charge you're putting onto the battery. This can give you all sorts of problems

    dgardel wrote:
    Yes correct, the charger/maintainer connected directly mislead the BMS; your battery is fully charged but the BMS still "think" that the battery charge is always as before, unchanged.
    BruceT
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by BruceT View Post
    Thats what I used to do with my cheapie charger. Also do the same when using solar power.

    Some replies I got on Disco3 for future reference:

    Dudleydisco wrote:
    If you use the -ve terminal of the battery rather than a chassis ground, then the BMS doesn't register the charge you're putting onto the battery. This can give you all sorts of problems

    dgardel wrote:
    Yes correct, the charger/maintainer connected directly mislead the BMS; your battery is fully charged but the BMS still "think" that the battery charge is always as before, unchanged.
    Hi BruceT

    yes the negative terminal of the comfort connect plug MUST be connected to an earth point. There are a few of them around the battery area. That way you won't experience any issues.

    This BTW is how to connect long term maintenance chargers to vehicles with lots of electronics and "smart alternators". All our modern cars have their leads connected like that. Never had an issue.

    Try it that way and I am sure it will be ok. If not check if you have auxiliary equipment added to the vehicle, which may interfere due to incorrect wiring.

    Let us know the outcome please.

    good luck!

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  23. #19
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    OK - D3 older technology
    I have a Brad Harrison on my front bumper connected directly to the battery via a fuse.
    Use this where I need power for compressor etc, have also connected my charger here, not a fancy, clever one though, and have never had any issues.
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    Default Re: D4: Low Battery Warning - "Please start vehicle" with CTEK

    Quote Originally Posted by MariusFourie View Post
    The reason why chargers and jump starting uses a ground on the chassis is to avoid a spark close to the battery where flammable gasses may be.

    The low voltage may be due to the charger "loading" the battery to test it's condition before running a charging map.

    If it's easy to get to, just undo one of the poles and leave the charger straight on the battery.
    Not on these vehicles it isn't.

    The charging and engine management profiles are measured via the negative lead to the battery (there is a processor in there).

    The vehicle cannot measure its power reserves or demands if you go directly to the battery.

    If you do as I mentioned and connect Charger Pos to Battery Pos and Charger Neg to the Earth point directly in front of the battery box it will work perfectly.

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