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(Post Link) post #1 of 4 Old 12-08-12 Thread Starter
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Battery discharging

Hi All

I've had to get my 159 jump started twice in the last week as the battery is empty. Something is obviously discharging it but I don't know what.

The battery is only about 6 months old and what ever has happened must be recent as we were away on holiday for a week 2 weeks ago and it started fine when we came back.

The car is fine if I drive it every day, it's when it's left for 2 or 3 days does the battery run flat.

Anyone got any suggestions what it might be? I've checked that the terminals are properly connected.

Ta in advance.
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Even if the battery is only 6 months old , if its a cheap or worse a mismatched (wrong specs) battery then a diesel 159 could 'kill' it easily in 6 months.

If its not a sealed battery, check each cell is properly filled. If its specs are under what the car needs or it was a cheapo Halfrauds battery, replace it.

If you are 100% sure the battery is good specs and make, you can disconnect the negative and connect a good quality meter between the battery and negative connector (no key in) with the meter on amps and see what the current drain is. That would tell you if there is a short or excessive drain but, be careful if you dont have a good meter, the available current in the battery will fry it instantly (mine is good make and will only register up to 10amps which i suspect is no where near high enough for the spike you get in current connecting a battery as all the 'capacitors' etc 'load' up).

EDIT: After a few mins thinking , if you want to reduce the 'spike' you could connect the amp meter whilst battery is connected and then whilst maintaining the amp meter connections you would disconnect the terminal so that the meter is still bridging the battery and terminal. Shouldn't get the high drain (that causes that spark) then. Check the battery is a good make/specs and for low liquid level in cells first , a meter is an expensive thing to fry if you dont understand what I am on about completely

Last edited by TimboZero; 13-08-12 at 06:10.
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checked alternator ? if battery's good something is draining your battery. just a thought,,
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(Post Link) post #4 of 4 Old 13-08-12 Thread Starter
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I did wonder about the alternator.

Cheers Timbo. For your thoughts. It's a good battery. I got it done my a local Alfa specialist. My old one was a crappy, under spec job. Think I'm just going to have to drop it round his as if it's nothing obvious it will be a bit beyond my capabilities.
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battery , discharging

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