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Battery overcharging battery out of water

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07 Milan overcharging battery. Replaced alternator. Still overcharging battery. Original alternator bench tested good. What would cause this.


i would say pcm.these. are notorious for getting spiked from ignition sys.have ya had any perfomance problems in the past?

Oct 21, 2014 | 2007 Mercury Milan V6 AWD Sedan

1 Answer

1996 toyota corolla, battery & alternator


If the battery has been overcharged then the cells will be damaged . Have a load test done on the battery to confirm failure and if so then get a new battery.. have the alternator checked at the same time because there is a possibility that the regulator in the alternator has been also damaged allowing over charging of the battery. By having incorrectly connected the jumper leads then you may have also damaged the cpu unit of the engine management box. Best have an autro electrician look at it .

Jun 26, 2013 | Cars & Trucks

2 Answers

I have a car battery that is giving me problems. The acid was low. So I heard you can substitute water. So I did that and when I leave the car running the water is coming out on top. Is that ok? If not...


If you added any water to the battery I hope it was distilled water. Anyway if the battery is "boiling over" then I would inspect the charging system. It sounds like the battery is being overcharged by the alternator possibly caused by a failed voltage regulator. I wouldn't drive any more, as a severe overcharge can cause the battery to burst sending acid everywhere.

Jun 27, 2011 | 2004 Chrysler Sebring

1 Answer

Put a new alernater an still over charging


Over charging could be the result of several things including:
    Faulty Voltage Regulator
  1. A car's battery will overcharge if the voltage regulator isn't working correctly. A voltage regulator is usually part of the alternator, and is used to keep a steady flow of voltage to the battery. If the voltage regulator is defective, it will send either too little or too much charge to the battery. If it sends too much, the car battery will overcharge. The voltage regulator is easily replaceable at an easily affordable price, sometimes for as little as twenty dollars, as of 2009.
  2. Faulty Alternator
  3. Sometimes the alternator itself can be at fault. The alternator is the device that converts the mechanical power of the engine into electrical power to charge the battery. When an alternator breaks, it usually stops creating electricity for the battery, which will then eventually die. However, if the wrong alternator is placed in the car, or if the alternator is running at the wrong pace, it will create too much energy for the car battery, causing it to overcharge. The alternator is another easily replaced part.
  4. Incorrect Charger Use
  5. If a battery charger is used to charge your battery outside of your car, improper use of the charger can result in overcharging. If a battery is placed on the charger too long, it can result in overcharging, and a significant decrease in your battery's lifespan and efficiency. This is why it is important to read about your specific battery and understand how long it needs to charge to be effective. Too much charge will lead to problems.
  6. Faulty Battery Chargers
  7. Sometimes chargers can be faulty. Their settings may be wired incorrectly, or the charges labeled incorrectly. As a result, your battery may be getting overcharged, even if you are carefully monitoring your charging. This is a problem that is hard to avoid, as manufacturing mistakes can happen anywhere, anytime without warning. It is a good idea to test your charger regularly to see if it is running correctly.
  8. Heat
  9. Extreme heat in the summer can also have an adverse effect on the car battery. If the battery has been previously overcharged, extreme heat can increase the problems caused by overcharging, and exacerbate any other problems with the battery. This problem can be hard to avoid if you live in a warm climate. The only real way to ensure safety against this problem is to avoid overcharge in the first place.

Feb 27, 2011 | Ford Expedition Cars & Trucks

1 Answer

I've got a '71 ford custom w/305.The battery overcharges to the point where it boils the water out.The alt. & voltage reg. have gone out twice since this started.The back of the ammeter looks like it...


while it is acting like a faulty voltage regulator, have you been able to monitor the voltage when overcharging? Are the grounds all in good condition? I seem to recall this many years ago. I'll shake the cobwebs loose if you contact me back and see what help I may be.

Feb 17, 2011 | Ford F Cars & Trucks

1 Answer

Water in new vehicle battery is being replaced frequently, there is no battery leaks and the battery warning light does not indicate a problem.


I would start by checking the charging system to make sure its not overcharging, this would cause the loss of water( acid ) then i would remove the battery and check the bottom for any leaks, good luck, theres no other problems that would cause this loss of battery acid,

Feb 13, 2011 | Nissan Altima Cars & Trucks

1 Answer

What damage can be done by the alternator over charging?


If overcharging to much can damage the computer and burn up the battery, if the battery is a service free battery then it could boil the water out and if their is a spark it could cause the battery to explode. Most free maintenance batteries are not maintenance free, they can still have water added to them and need cleaning from time to time as the posts corrode up.

Apr 08, 2010 | 2007 Chevrolet Uplander

1 Answer

Battery overcharges and light is on


Never saw a charging system problem cause anyone to fail inspection. But, overcharging will cook the water out of your battery and can damage the computer system if not taken care of. Overcharge can be caused by either a grounded alternator field wire or a bad regulator. Since the condition appeared after replacing the alternator it too is suspect as an internal grounding can also cause that.

Jul 20, 2009 | 2003 Ford Focus

2 Answers

Alternator may be overcharging?


Yes It sounds like the voltage regulator inside the alternator has gone wide open .It can also ruin your battery and explode the battery.I would have it hooked up to a alternator tester and just to make sure it's not just your gauge.hope this helps

Jan 24, 2009 | 1999 Chevrolet Silverado 1500

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