I'll charge the battery, and if the car sits for 3-4 days, when I go to start it, it's dead. The battery is one year old. I brought the car to a shop, they checked the alternator, and said there was no problem with the alternator.
Do you think the problem is a short or bad battery?
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Re: Battery keeps going dead
Hello raiderfan520....Have the battery "load tested" this will tell ya if the battery is defective, one bad cell will draw the others down. If it's bad and only 12 months old you should have warranty left. (free replacement or pro-rated)...If your battery load tests OK, then you have an amperage drain going on while the vehicle is parked. This is called a "parasitic drain" Make sure no interior lights, under hood, trunk lights...etc. are remaining on. I hope you don't need the following information i'm about to give you, but here are the steps to locating a parasitic drain.....
Remove the negative side battery cable from the negative battery terminal.
Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers. There you go...everything you never wanted to know... I hope this will fixya up...good luck.
PS...what kind of season are the raiders going to have this year? I'm in LA county and "Manny being Manny" has turned me away from baseball for now.
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Re: Battery keeps going dead
Possibly a shorted battery most likely not only after a year. sounds more like a parasitic drain, something in the car is not shutting off. check the battery first to be sure.
then you can take an amp meter attach it to the positive post. and the battery connector. do not disturb the car.(do not try to start play the radio or anything)for an hour. attach a amp meter to the battery positive post(red lead) and then attach black lead to positive battery wire clamp. while it is attached. then remove the clamp while keeping all leads connected. remove fuses till the meter reads zero.
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Dealer should have been able to figure this one out!
Best bet to trouble shoot is next time it is going to sit for a couple of days disconnect the battery. After the couple of days pass hook up the battery and if it's dead then the battery isn't holding a charge, if not then something in the vehicle is draining the battery.
If you live in a colder climate weak batteries tend to be more of a problem as temps get colder.
If the battery is more then 3 years old it is a prime suspect.
Ultimate solution is change the battery... because the capacity of battery cells is poor.. this could be the reason if battery is old... Still u can take a chance by completely removing the battery fluid and replacing it new battery fluid... but keep in mind that, after doing so, u'll need to charge the battery fully before using it in car... This kind of battery problem is common in all diesel cars, the reason I think is, Diesel engine need heavy torque to start that draws heavy current from battery.. so if you are facing starting trouble for the vehicle, then battery is surely going to discharge frequently... Still try the solution mentioned above and still the problem persists, then replace the battery with new one. ((I am considering that the battery you are having is 3-4 years old...))
Even with the wire removed, are you saying it goes dead while driving or just sitting . if it goes dead wile driving then the alternator may not be charging the battery as you drive but if it goes dead while the car sits then there is a draw some where. if you sent me the year make and model with the engine size and also let me know when it goes dead in 1 hour, while driving or car just sitting and i will help you solve the problem. good day
Maintenance-free batteries really don't tolerate complete discharge very well. If the battery was already several years old, letting it go dead probably was the last straw, so now it may not hold a charge more than a day or two, or it may have so little capacity that if you start the car a couple of times without a long (20 min+) drive between starts to recharge the battery, it won't be able to start the car the next time without a jump. Probably time to go battery shopping.
You didn't mention your model, but many BMWs use unusual battery sizes (group #s). Most of us use a smaller, common size battery, or a larger (longer) battery because original sized batteries are hard to find at the retailers, and when you find one, it may not be very fresh. If your battery will only last six or seven years at best, you don't want to buy one that is already a year old, and has been sitting on the shelf partially charged for that year.
Running so few miles has accelerated the aging of the battery - the battery never had a chance to fully recharge in such small trips - so now you have to replace it a year sooner than usual.
Just replace it.
theres a draw somewhere. these are sometimes hard to pinpoint.start by checking that all lights turn off,glovebox underhood light all lights,you will need a meter to meter the draw amps, then with key off doors closed look at the draw amount,.02 to.03 is allowable, start removing fuses and watch if amps drop,one fuse at atime, start with this to try and pin down a location of the draw.hope this helps.
replace your battery, a battery discharges every day you dont run the alt. to charge it up... after a week or 2 weeks the battery would be dead, just from a car sitting not being started... if you are not using the vehicle, it is a good thing to replace the battery, and every couple days just start the car up and let it run a while to charge the battery.... if you are going to have to leave the car for a while without starting it, then disconnect the battery, and remove it from the vehicle... you can buy a cheap trickel charger for the battery when it is out that will keep it charged till you decide to put it back in.... hope this helps you...
if you removed the dome lightbulb then there is no longer a draw from the battery there but if the ashtray light light does not go out then over a period the battery will go dead or drained to the point to not the vehicle