Alternator might be bad, or is going bad. I assume you're using a stand-alone batter charger to recharge the battery? If so, you'll need to replace the alternator, as it's not performing the function of recharging the battery. If you take longer trips, the battery might run out of juice and the engine might stop.
If not the alternator, you definately have a short somewhere else that needs addressing.
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A new battery comes charged well enough to start the car, if it keeps going flat u have a problem either with the charging system or a power drain, so once car is turned off sonthing is staying on draing the battery. Or the battery could be faulty but very unlikely. To check the charging start car and put a volt meter on the terminals of the battery should be reading aprox 14.2 v if it only reads 12 something then u have a charging fault. If charging fine then have to test for a power drain and the easiest way to do that is to open bonnet or boot depend where battery is lock the vehicle up and wait about 20 mins for the car to shut down Ecus etc remove earth terminal off battery and put a 12v bulb from the earth terminal of battery and the earth lead if the light shines u have a power drain remove each fuse in turn remember to put it back after until light goes out then u have the offending circuit. Hope this helps
Check the low beam relay, it may have no power to it. If not check the light switch for power at all terminals as you operate it. If the power is Ok then the relay or the bulbs may be faulty.
How old is the battery it may not hold a charge anymore. get it tested with a load test. Make sure the alternator is charging. The battery voltage should read about 14 volts when charging and just over 12 volts when not. Turn on all the lights and see what the voltage is then, should be still 12 volts.
My 1998 passat does the same the other way around.Does the courtesey light on the bottom of the door work?, if not then it's a brown wire going to the courtesey light(the thicker of the 2) that has a break somewhere.I ran a short test lead(earthed to the body if i remember) to this direct and everything worked like new but the light would remain lit all the time with the door closed.These wires are all interlinked with the windows/central locking/door switch/courtesey light and forced door entry(not breaking of glass).The lazy way is to run a link like i did and remoe the bulb but get a auto electrician to advise you first.
You may have another Alternator issue so get the charge rate checked. Then, look for a leakage issue like the glove box lamp staying on, or the lamp in the trunk or boot staying on. I have even seen the lamps in the footwells stay on and drain a battery overnight.
An easy test is to use a test lamp. Make sure all the doors are closed and everything is turned off (tail lamps etc). Disconnect the battery negative and connect the test lamp between the battery post and the cable clamp. If the lamp lights and stays lit, you have a leakage. Begin by disconnecting the courtesy lamps or removing the bulbs. When the test lamp goes out, theres ya leakage. If you have a charging system connected to the vehicle which charges a second battery, like one in a caravan, check those circuits too..
And even though the Alternator is new, it may still be the cause of the problem.. So check it out as well..
Check the alternator is not faulty.
The battery terminal voltage when engine is running should be approx 14.5V with headlights or venilation blower motor running.
The battery light indicator 'on' usually means the alternator is not charging.
no relays in footwell ,but as i remember with these cars they have a problem with the multiplug that goes into the fuseboard ,happens with mine as well the ac stops and the left hand turn signal just flashes fast and the back flasher light doesnt work .quick soloution without playing and thats to run a feed from the battery to the fuse .saves a lot of messing about trying to take fuse board out and close the connections up a bit .Just bare the wire back a bit push in with the fuse on the feed side .Easy
one in each footwell and some in the centre console .their isnt a main fuse as such but their is also a fuel cut off /accident switch but dont know where it is,could be in door pillars ,behind panel in footwells ,or in the boot ?? Try putting battery on charge ?? saying in spain ,,tienes tetas e ruedas soy peligrosa