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  1. Battery low on 3.0 Tdi 
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    Hi all. Iíve had a search through the forum which has given me some good pointers as to what to check. Iím hoping someone might be able to give me some easy things to try before taking my car to a garage.

    I took delivery a few weeks ago of a 55 plate S-Line 3.0 TDi Quattro Avant, with 149k on the clock. I know the previous owner and he has treated it well.

    However, a few times this week, it has said battery low before starting. Iíve put a simple voltmeter into the cigarette lighter socket to see what itís been reading.

    The car reads about 11.5v and drops to 10.5 as I start it. Once the engine is running it reads 13.5v. I can drive a fairly short distance and then turn engine off and it will then read 12.5 ish, but will fairly quickly drop back down bit by bit.

    I have checked the positive charge terminal under the bonnet and that is hot to the touch.

    I checked with the previous owner and he said he had this issue two years ago. The AA then replaced the battery with a heavy duty Bosch battery in November 2015 and the problem went away.

    Where do I go from here?
     
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  2. Re: Battery low on 3.0 Tdi 
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    Winter is coming, sniffs out weak batteries, surprised a 2 year old bosch can be weak but. Can depend on history before fitting. Aa coukd have used it for a few jump starts, car batteties dont do flat and recharge thats what leisure batteties are for. Different make up.
     
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  3. Re: Battery low on 3.0 Tdi 
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    Battery not holding charge.
    Check to see if there is water in the battery,may be dry also check if both terminals are tight.
     
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  4. Re: Battery low on 3.0 Tdi 
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    If the battery is failing, would that cause the charge terminal in the front to be hot? Or is that likely to be something else?
     
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  5. Re: Battery low on 3.0 Tdi 
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    A failing battery does not cause the charge terminal to be hot. The heat in the charge terminal indicates that there is a resistance there - either the connecting surfaces or the lead itself - and that lowers the amount of charge that can go into the battery from the alternator. So if the battery is never properly charged, voltage readings will be low.

    Voltage readings anywhere in the car are only a poor substitute for a proper discharge test of the battery, which may also have issues of its own. Unlikely for a Bosch which is only 2 years old but as swwalker says, it may have had a hard life. Start with the cables to the charge point / the charge point itself.
     
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  6. Re: Battery low on 3.0 Tdi 
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    Quote Originally Posted by prophet View Post
    If the battery is failing, would that cause the charge terminal in the front to be hot? Or is that likely to be something else?
    It may be battery cell or cells are shorting out thus making terminal go hot.As I mentioned before check battery water.
     
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  7. Re: Battery low on 3.0 Tdi 
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    Thanks for all your advice people. I have had a look at the battery and it is a Bosch S5 015. It is completely sealed so I canít check the water levels.

    I left the car connected to a genus charger for 24 hours. The charger said it was at 25 percent when it started charging.

    After 24 hours it said it was full and I took the charger off and did a couple of measurements with a multimeter. With everything off apart from the interior light in the boot, and the lights on the inside of the tailgate, I got 12.45v at both the charge terminals in the engine bay, and directly on the battery itself. However when I started the engine running and had all the lights on, I got 14.15v in the engine bay, and 13.77v on the battery itself.
     
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  8. Re: Battery low on 3.0 Tdi 
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    Quote Originally Posted by prophet View Post
    Thanks for all your advice people. I have had a look at the battery and it is a Bosch S5 015. It is completely sealed so I canít check the water levels.

    I left the car connected to a genus charger for 24 hours. The charger said it was at 25 percent when it started charging.

    After 24 hours it said it was full and I took the charger off and did a couple of measurements with a multimeter. With everything off apart from the interior light in the boot, and the lights on the inside of the tailgate, I got 12.45v at both the charge terminals in the engine bay, and directly on the battery itself. However when I started the engine running and had all the lights on, I got 14.15v in the engine bay, and 13.77v on the battery itself.
    thats great,it means you will be staying out of trouble.
     
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  9. Re: Battery low on 3.0 Tdi 
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    12.45 isnt much cop, leave it standing for 24 hours them measure it again.
    After standing for 24 hrs 12.7/8 is where you want to be, doesnt seem like much difference but 12.45 is approx 77 percent
     
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  10. Re: Battery low on 3.0 Tdi 
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    Happy motoring.
     
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