Question about 1987 Jaguar XJ6

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Something electrical is draining battery on 1987 XJ6;

After replacing the battery twice and having the car completely checked out by a local Jag dealer, I still have problems with irregular starting. It runs for a short time then won't start at all. Something electrical is draining the battery. Help!!!

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  • Woody J Hiatt May 11, 2010

    When it doesn't strart is the battery kaput?

    A simple cheap 2.99 voltmeter will tell you if the alternator is
    charging the battery around 14.4 votls and less as it charges up. Now
    there are computors that draw a small current even when you are
    not driving the car..

    Next thing is - if battery is being drained while you sleep- Remove
    a battery post ( after charging) Put a current meter in seriies
    with the removed cable and read the current draw. Start pulling fuses
    anywhere you want to and see if you find a large drop in current draw.
    See what that fuse controlled and look there for a problem.



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Have you checked the alternator? The alternator may not be charging the battery. With engine running, check the voltage at the battery (it should be ~14V). If it's less than that, your battery won't charge properly. You can take your alternator to auto store to have it load tested also to be sure. Sometime alternator issues don't show up until it gets hot. Defective alternators have also been known to drain the battery after the car has stopped.

Posted on May 10, 2009

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