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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batteries can self discharge especially in cold weather . Have a load test done on the battery to eliminate it from the equation. If the battery checks out ok then have an accredited auto electrician check the charging system as there may be problems in the rectifier of regulator. Check belt condition and tension as if the belt is bad or slipping then there will not be enough power generated to run the vehicle AND charge 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.
If it continually starts even when the headlamps are on, your battery probably is ok.
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.
taking a cable off the battery while the engine is running is a guaranteed way of killing the alternator . The alternator has not been checked properly as it has to be on the vehicle to test all the cables and regulator. If the battery was tested with a multimeter then it has not been tested correctly as it is done with a load tester to determine if the battery is capable of holding a charge under a discharge load.. Batteries can discharge internally as well as from a current flow though a completed circuit Ie-glove box light on --boot light on -- door light on relay coil shorting out . Take it to an accredited auto electrician and have the work done properly as it saves a lot of heart ache.
If your vehicle has done over 120,000km then the alternator will need to be reconditioned shortly. The battery light coming on is an indicator that your alternator is not charging properly. So you should get your vehicle to a good auto-electrician asap before your battery starts to go flat.
Not sure why the brake light came on unless it is warning of the lack of ABS but it can be a failed alternator causing the overnight discharge.
Alternators have semiconductor diode in them and when one fails, it can easily drain the battery within hours.
If you can get it moving, drive to one of the chain auto parts stores; they will check your alternator and battery while in the vehicle.
when you battery goes dead, the security system locks the car. When you charge the bathery, use the key to lock the door and hold until the alarm activates. open your door and you can now start your car...firstname.lastname@example.org
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.