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Alternator overcharging can be fixed a bad regulator

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The regulator is most likely built-in the alternator as it is with most modern vehicles. You may still be able to buy a new regulator, though and replace it.

Posted on Nov 13, 2014


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Posted on Jan 02, 2017

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SOURCE: battery overcharges

put a new regulator on and dont use secondhand bits from scrapyard

Posted on Jul 16, 2009

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SOURCE: my alternator guage will

check the voltage with a voltmeter. if reg is new and voltage still too high you may have a bad earth

Posted on Aug 04, 2009

  • 6927 Answers

SOURCE: overcharging alternator

This year it is not supposed to be in the computer,look on the firewall in the middle,I believe it is flat,and has a three wire connector,but only two wires in the plug,see if you can find it.

Posted on Feb 26, 2010

  • 28 Answers

SOURCE: my 10 month old alternator (built in regulator) in

get another autoelectrician

Posted on May 30, 2010

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1995 Lincoln Continental and the car will run for a while and just stop. The man at the shop says the alternator is not getting any elec. current. I am wondering if the Voltage Regulator is Bad.

you can change regulator if if you wish, but I would replace alternator with new one. The regulator keeps battery from overcharging. You need to measure the alternator output voltage it should 13.2 VDC

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Why is my battery boiling over 94 Telstar tx5 ghia

Your alternator is overcharging the battery VERY VERY BADLY. DO NOT drive that car until the voltage regulator is fixed!

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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 .

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2004 envoy alternator gauge pegging

alternator could be overcharging, cause of this is a bad voltage regulator, it should be internally in the alternator, (a way to tell this is to check your battery to see if it looks like its swelled, or pull alternator off and have it tested). if voltage regulator is bad it's more cost effective to just replace the alternator. but if not then good possibility your gauge has gone out.

Sep 13, 2012 | 2004 GMC Envoy

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

On my2006 pontiac gp battery volts start at 14.60 and will go to 12.90

Sounds like the alternator's voltage regulator might be bad, causing an overcharge then an undercharge condition with the battery/alternator combination.

I would see if changing the alternator which comes with a new regulator would work, or have the alternator's regulator changed at an auto electric shop.

Actually, the normal range on GM vehicles is like 13.2 to 14.2 volts while running.

Does the charge light go on, indicating a problem?

Oct 17, 2010 | 2006 Pontiac Grand Prix

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

I have a 1999 chevy malibu and it is over charging. I tryed a new alternator and that did not fix the problem. I tryed a new battery and that did not work either. so what do i try next

What do you mean overcharging? Put a volt meter on battery...It should be about 14.5 volts. Since you already replaced the regulator (inside the alternator) The only thing left is that the new regulator is bad. Easy to paperclip through hole in back to hold brushes until fully assembled then remove.

Aug 21, 2008 | 2001 Chevrolet Malibu

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