Question about 1994 Jaguar XJ6

3 Answers

My 1994 jaguar xj6 has a problem where the battery drains quite frequently. is this a common problem? or is it just a bad battery? the car was sitting for about 3 years and was not driven.

Posted by adamfrye24 on

  • Marvin
    Marvin Jul 18, 2010

    it is not a common problem.

  • Louise Hockenson
    Louise Hockenson Oct 14, 2021

    Thank you Marvin.

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3 Answers

Anonymous

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  • Master
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Charge the battery with an external charger for about 6 hours, then start the engine and measure the battery voltage with the engine running. It should measure 13.5 volts or more. If it reads 12.6 or less volts, then the alternator is not recharging the battery. Take the car to Autozone or similar business for a free check out of the alternator and voltage regulator. They will be happy to sell you any needed parts. Hope this helps!

Posted on Jul 18, 2010

  • Kirk Augustin
    Kirk Augustin Aug 31, 2010

    Good advice, but you should also tell him that he has to rev the engine higher than idle speed in order to get the alternator to kick in.

    With the engine off, he should also remove a battery terminal cable and see if a test light goes on when placed between the cable and the battery terminal. If it does, then something is on all the time and draining the battery over night.

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Steve Allison

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  • Jaguar Master
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Not only do modern batteries never last their stated warranty but if not used for several years can have contaminated plates that prevents them from taking any real charge and reduces their capacity by a bunch.
If you want to check this; drive the car a decent distance (or charge fully at home) to make sure it has had a chance to charge then, after returning, remove the negative (only, and always first if removing both) and allow the battery to rest disconnected. If it loses charge in a shorter-than-normal time and won't supply enough current to crank the engine, the battery is junk.
If it seems OK, you could have a bad diode in the alternator that is draining the battery but allows for operation with running engine.

Posted on Jul 18, 2010

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Louise Hockenson

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I have had the same problem & think some of it is due to the security system, as it may drain the battery.

Posted on Oct 08, 2013

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