Question about 1998 Jaguar XJ8L

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1993 XJ6 Jaguar has a flat battery every morning

Every morning the battery of my XJ6 is flat, I have had the vehicle checked out by an auto-electrician, and no discharge evidence was found, the battery is only 18 months old and appears to be fully charged , but is flat in the morning

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Disconnect battery overnight, if flat in the morning, fit a new battery !

Good Luck !

A Fixya rating would be nice thank´s...John.

Posted on Feb 20, 2009

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Why does my car battery drain overnight

After checking that there is nothing left on which could do this (you would notice) the likely causes are

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Battery was dead, charged it, started jeep but will not keep running, is it the battery

It could be the battery, yes, but it could also be an alternator fault.

If the alternator is faulty -( usually when the rectifier pack on the back of the alternator burns out) - the battery can run to earth and become flat within seconds, or it feels like a misfire when driving.

I once had a car that needed the battery charging every time just in order to start it. Once running, there was a misfire. Then the battery was too flat to restart the car. It was an alternator fault.

Disconnect the plug/wiring from the rear of your alternator FIRST. Charge the battery. Leave the plug DISCONNECTED from the rear of the alternator. Start your vehicle.

If your vehicle starts and runs ok with the alternator wiring disconnected - the alternator is suspect. The usual culprits are the diodes in the rectifier pack (the bit on the rear of the alternator). Burnt out, they can cause a battery to become flat within - literally - seconds.

Leave the alternator disconnected and try starting the car several times. Switch on your headlamps and try and restart the vehicle a few times over a 15 minute period.

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Even better ... take your vehicle to an auto electrician. It would probably take 2 minutes for them to dignose the problem. this saves you 'guessing' and buying replacement battery/parts that aren't at fault.

It doesn't sound as though you have a big problem .. just one of the many 'irritations' that we motorists suffer...

If the problem is the alternator there's no need to replace the whole unit - you can replace the rectifier pack on the rear. If it is the battery at fault (an auto electrician will tell you within seconds) .. well, that's life.

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Flat battery every morning

With a full charge the battery needs to be load tested, then a draw test needs to be done, to determine where the draw is, when vehicle is sitting. Auto electrician should know how to isolate draw. If you decide to try it yourself, buy a 12v test light & get back to us, we'll explain how to do it.

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