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One more question, since i have a new battery, and we pin point it to be the alternator, will it drain the battery while the car is sitting over night, i need to know and thanks

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  • Cars & Trucks Master
  • 3,519 Answers

Hi Laura:
Most modern vehicles have a bunch of "smart" things that draw a very small amount of power all the time, so left alone, the drain on the battery will eventually make it go dead.
Anything that draws more power, like a fuel pump or lights, is usually switched so that when the ignition is off, there is no power consumed.
The short sweet answer, The car should be fine sitting overnight. It might be a good idea to have jumper cables and a friend handy just in case.

Posted on Mar 30, 2015

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: battery drains in my 1984 BMW 318i

I have the same car I had the same problem.If you have the correct battery for your car with the same problem you have a short or positive ground in your dash/electric fuel pump/fuse box also be carefull of how you take the key from the ignition and if they're old replace them.

Posted on Apr 17, 2009

  • 11 Answers

SOURCE: 96 Mitsubishi Galant won't turn over

check the charging from alternator if ok you might have a blown fuse ect if no charging 14v id say alternator brushes . or regulator in the alternator

Posted on Aug 26, 2009

  • 14036 Answers

SOURCE: I have a bran-new alternator. But my car still

CHECK ALTERNATOR FUSE + FUSE LINK TO MAIN BATTERY FEED WIRE.MAKE SURE YOUR BATTERY CABLES IN GOOD SHAPE.IF THEY ARE OLD REPLACE THEM.BECAUSE THEY WILL CAUSE HIGH RESISTANCE IN CIRCUIT CAUSE CHARGING PROBLEMS. AND CHECK ALTERNATOR POSITIVE WIRE AND VOLTAGE REGULATOR WIRE.MAKE SURE DRIVE BELT NO SLIPPING.ALSO MAKE SURE YOUR BATTERY IS 12.5 VOLTS.IF BATTERY IS WEAK ALTERNATOR WILL NOT BE ABLE TO CHARGE IT.IT WOULD BE LIKE A BUCKET WITH LARGE HOLE IN IT.KEEP FILLING IT WITH WATER IT WILL LEAK OUT.IT WONT HOLD NONE.

Posted on Jan 30, 2010

  • 1146 Answers

SOURCE: Headlights causing battery drain while driving?

Hi:
Though your car seems fine without using the headlights, you have a charging problem, and need to get a couple things checked out. First make sure your battery connections are clean and tight. Your alternator belt should also be checked to make sure it is serviceable and properly tightened too. Your alternator should be checked under load, and lastly, your battery too. Most auto parts stores, such as auto zone,will check your parts for free,so you should only be spending money on what is broken!

Posted on Feb 17, 2010

  • 8404 Answers

SOURCE: Cars battery drains every night. local car repair

One by one, disconnect the fuses until you see no change on a volt/ohm meter connected to the battery with the engine not running.

Posted on Mar 06, 2010

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2 Answers

Ive put multiple alternator and batteries it will do fine for awhile and then you have to jump it then its on for a while


Sorry you spent to much money on replacing good parts. The ECM is bad. Not hard to figure out. If the alternator isn't grounded out the field inside won't engage. To many places will change the alternator and battery. Point and guess, is what I call it. If you paid to have it diagnosed and repaired, take it back and demand your money back.

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Nothing wrong with altenator nor battery but want keep a charge


Disconnect battery when not in use and see if it will start if you connect it back up just before you need to use it. If it works something is draining battery.

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I have a 1996 GMC Sierra 5.7L v8. It sat for quite some time on a slow charge as my grandpa was not driving it. I inherited it and it did fine for a time unless it let it sit for more than a day, then the...


With a charged battery, measure the voltage across it, should read 12 or more volts. Remember the reading and run the engine on a fast tickover and the voltage should rise quickly to more than 13 volts and the ignition warning lamp is off. If it reaches 13.8 to 14.6, with the headlamps on, then the alternator is fine.
If it is diesel, check the glow plug relay is not jammed on.

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Mitsubishi Diamante 2002 - slow battery drain when not running.


This problem may be a drain or a bad battery or alternator.

The first thing to do before going on trying to find the system that is draining the battery would be to have the battery tested and charging system tested.

A weak battery will seem ok after the car is jumped or will barely start the car and the alternator will charge it even though the alternator is overworking due to weak battery and during the day or when car does not sit long it will seem ok. then when car sits overnight or a few days battery will weaken on its own, making it look like a drain,

so first step is battery test and alternator/charging system test.

Jan 06, 2013 | 2002 Mitsubishi Diamante

1 Answer

My car drains my battery and the alternator is good


Something is staying on while its not running, could be a light somewhere that should be off thats not. With a good alternator and a brand new battery there should be no reason for the battery to just die within a day unless something is staying on. Pin point what is staying on and we can go from there

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can be bad alternator, or bad battery most like battery needs water

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New battery keeps losing power...


Hi!
There seems that the current is leaking frm somewhere.
Firstly put off all equipment and ignation.
Keep a multimeter in hand.
Remove all the fuses frm the fuse box.
Now..
one by one touch the pin of the multimeter(RED) to one end of fuse solket and the other (Black) pin to the other soket where the fuse sits.
There should be NO reading... keep going from one fuse point to another.... the point wher the multimeter reads while all switches OFF means from tat equiptment the current is leaking... Now check That fuse is for which equiptment e.g. for AC or for blinkers or for headlights etc etc.
Get thet unit checked / repaired / changed as the case may be.

Regards
Berry

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95 concours battery keeps draining out


CHECK THE FUSE OF THE ALTERNATOR OR CHECK IF THE ALTERNATOR IS CHARGING

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Interior lights flash on & off, battery drain after sitting 2 day


Check to see if the ground pin to your doors are bad and don't forget the one to the tail gate too. Good luck.

Apr 03, 2009 | 1998 GMC Jimmy

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1998 Corvette drains the battery in less than 2 days.


No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

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