Question about 1994 BMW 5 Series

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Goes for two or three weeks then has discharged even after fitting a new battery

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Sounds as though you have a bad altenator or a bad voltage regulator.

Posted on Sep 24, 2010


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Replaced battery now there is zero juice

Don't assume that a new battery is ok. Personally, I've fitted a new battery to later discover that it was that new battery at fault.

However, it's quite rare ..

If your battery is discharging very quickly irrespective of whether the engine is running or the car is parked - suspect the alternator. Inside the alternator there is a rectifier pack - diodes - if this fails it can allow your battery to discharge very quickly - sometimes within a minute or two, quite literally.

If you can, disconnect the leads from the back of your alternator and charge your battery. Reconnect the battery but not the alternator. If your car starts and continues to start without the battery going flat - your alternator is at fault.

The only other fault that can cause a healthy battery to discharge is a parasitic drain - something is remaining 'live' after the engine is switched off and draining your battery power.

If you drive your car to a spares shop/auto electrician they will be able to tell you within a minute if your alternator is the problem.

Apr 22, 2016 | Hyundai Motor 2002 Sonata

1 Answer

Citroen saxo problems

are you putting the dead lock on when you lock the car as using this will drain the battery. also there is an external alarm fitted when it fail to keep charge it will use the battery power. they are prone to catch fire so would check this to.

Feb 22, 2014 | Cars & Trucks

1 Answer

Car parked up over a week battery goes flat even when new battery fitted no lights or radio left on

Remove the earth wire and place an amp meter in the circuit and read what current is flowing .. Check that the interior light is not on ---glove box light is not on and the boot light is not on. Check that the fan is not running

Feb 22, 2014 | 1998 Citroen Saxo 1.1

1 Answer

I have a 2003 ford focus wagon second hand. My battery died out and I thought the alternator was the problem. Brought my car to an alternator repair shop and they said the alternator is still good. I ended...

Lead acid batteries don't like being discharged flat, and it could now be damaged and unable to hold a charge. It does sound as though the voltage regulator part of the alternator is allowing discharge to ground when it should not. You would seem to have a good warranty claim on the battery given they did check the alternator and pronounce it OK.

Nov 04, 2013 | 2003 Ford Focus

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Four new batteries fitted since new - car 3 and half years old 13800 miles since new. dealer keeps fitting new batteries. cannot find fault - cannot trust this Hyundai i30. Writing to Hyundai - was in...

Muriel-sounds like you do not drive a lot, so that is probably causing a problem with your batteries-a battery is like a water tank, it starts out full, and it drains when the car is not running due to loads imposed on it by the radio memory, computer memory, and other things. If the drain is long enough (car sits) the batteries' ability to 'recharge' is diminished due to the conventional construction of a standard battery. A normal car battery can only be discharged a few times and come back-if you do a lot of short trips, and it sits long period of times, that is brutal on a CONVENTIONAL lead/acid plate battery. You should seriously consider getting a deep cycle battery-they are usually used in Marine enviornments, but can be used in cars (I have an Optima Yellow top in my Jeep, it is not driven much, and sometimes is only used for short trips). While these batteries are pricy can be found for about $200 or less) they can easily last 8-10 years and they car be fully discharged hundreds of times and they come back fully when recharged-ideal for your circumstances.

this is assuming the dealer knows what they are doing...after the car sits overnight, the battery should read 12.5 volts. when first started. it should read close to 15 volts at the battery AND at the large post on the back of the alternator-it should gradually drop down to around 14+ volts, and should stay close to the even with the lights and heater fan running ar full blast. if it is doing this, your driving circumstances dictate you get a battery more suited to you driving habits.

Apr 13, 2011 | Hyundai Accent Cars & Trucks

1 Answer

Hi there i have fitted a new

When you turn on the lights or fan there is a draw on the system causing the alternator to kick in, therefore the higher voltage. Probably without them on and your battery is charged, the current would be less or none and you may just be measuring the battery voltage. If you discharge the battery the charging voltage will probably go up because then it will be in a charging state. So your new alternator is probably OK.
You can test it by driving --if the battery becomes discharged, then the alternator is not working

May 08, 2010 | 2005 Subaru Impreza

2 Answers

Car wont start but the lights, radio and everything battery operated comes on but it just makes a click noise when trying to start engine

If you can hear a click (quite loud) from the engine compartment, but the starter won't crank, this also could be caused by discharged battery. Battery problems - Discharged or dead battery is one of the possible reasons for a car not to start. Very common is the situation when we forget to turn the lights off overnight (the dome light, for example), which causes the battery to drain. In this case when attempting to start a car, all you will probably hear will be a clicking noise - there won't be enough power to turn the starter. Here is the simple way to check if the battery is discharged: Turn the ignition on. With the engine off, turn the windshield wipers on. If they move way too slow, much slower than usual, the battery is probably discharged. Also look at the dashboard lights - if they appear very dim, the battery is probably discharged.
If the battery is relatively new, it can be recharged. All you need to do is to boost your car and let the engine run for a while to charge the battery.

However if your battery is more than three-four years old, you will probably need to buy a new one. Sometimes, an old battery may even die with no apparent reason, even if the day before it was OK.

If the battery is OK, the starter solenoid, starter cables or the starter motor itself could be a problem.

Check it and tell us news.

Mar 29, 2010 | 2000 Buick LeSabre

1 Answer

Have a 01 Tahoe with new red top and fairly new alternator. It charges at about 14v. But if I leave the Tahoe set for a week, it wont start.Where do I look for a voltage leak. The Tahoe seems to be working...

Start with the basics; Is the reason the car does not start is that the battery is discharged after a week of sitting or a case that it won't start without a jump although the battery is still good. If the car just does not start after sitting then try the following; Pull the negative battery cable and let the car sit overnight. Reconnect the cable in the morning and see if it starts. If it does then you are looking for something that is pulling current from the battery. Could be lots of things; light on in the glove box or trunk, a short in a wire, etc. You can try pulling a couple of fuses each evening and in the morning, replace the fuses and see if the car will start after sitting. If it continues to discharge the battery then try another set of fuses. The day it starts after sitting then you have narrowed the electrical system that is discharging your battery. Focus on those systems

Feb 21, 2010 | 2005 Chevrolet Tahoe

2 Answers

2003 Jetta GLS (not TDI) alternator replaced twice in 2 weeks. WTH?

If the problem was in the alternator, the battery would have been discharged and you would not have been able to restart the car (unless jumped, but not have run for more than a few minutes before shutting down again) So, my answer: No.

Jun 02, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Something is running down the battery

fit a battery isolator till fault foundor disconnect battery when you stop.normal cause of battery discharge is diode in altenator,it allows current to earth out slowly

Nov 03, 2008 | 1998 Buick Century

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