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I changed the computer I'm my 99 eclipse and my battery is still spewing acid. I understand it could be my voltage regulator and mine is located in my computer not on my alternator.. With a new computer put in what else could possibly be wrong?

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The battery ? Replace the battery quick !

Posted on Dec 12, 2013

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Voltage regulator


In some brand of alternators the regulator and brushes are an integral part and it is a matter of removing 2 screws and lifting out the part. On others the regulator is entirely separate unit located some where else on the vehicle. The voltage of 15.3 is on the upper end of the charge rate but it would be acceptable . Nominal voltage for a regulator is 14.5 to 15.5 volts. Understand that a battery is actually 13.2 volts not 12 volts and you need 14 volts for the battery to charge effectively. The higher the voltage the higher the amperage to run everything so if your alternator regulator is set at 14.5 volts then the max amps of the alternator would not be reached and if you have a current draw to run everything that is more than the output of the alternator then the battery will eventually go flat. Find yourself a reputable auto electrician and discuss the problem with him not a local mechanic

Dec 16, 2013 | Dodge Grand Caravan Cars & Trucks

2 Answers

Alternator charges at 14.4volts, replaced regulator, same result. boils battery.


The max charge voltage is usually around 14.5 volts, so 14.4 is not high.
Its possible the battery has a dead cell and that is causing the acid problem.
You might want to check with the dealer on what the max voltage is for your car.

Oct 08, 2012 | 2001 Hyundai Elantra

1 Answer

Where is the voltage regulator located on a 99 Plymouth neon?


where is the voltage regulater on a 99 plymouth neon

Jun 19, 2012 | 1999 Dodge Neon

1 Answer

Where is the voltage regulator located in 99 merrcury cougar


now days all voltage regulators are incorporated into the alternator. so if you have charging problems it is more then likely the alternator is bad, or needs a rebuild. good-day !

Jan 18, 2012 | 1999 Mercury Cougar

2 Answers

I have a new battery =it relases acid that is ruining my chasis in my 1956 chevy=took battery back to retailer but they refuse to replace it =do you have any suggestions=please reply JOHN


if this is the problem it seems to be overcharged causing this. change the voltage regulator if the output of voltage is over 13.5 volts

Jun 05, 2011 | 1996 Chevrolet Classic

1 Answer

I put a 99 3.2 dodge Concorde engine in a 01


You cannot run an external regulator on this, your only solution is to replace the ECM.

Dec 02, 2009 | 2001 Dodge Intrepid

1 Answer

The computer in our 2003 Ford focus is not having the alternator charge the battery . we have had all things tested ie.. alternator,battery,all the wires..they say it is the computer, not sure if we should...


sounds to me like you have a bad voltage regulator. The voltage regulator will shut off the flow of juice to the battery if it exceeds a level, usually 14.5 volts. So if the alternator is over charging then the voltage regulator will shut off the flow to keep your battery form dying completely and having to be replaced. Now a days the regulator is located in the alternator.

that was your education for the day. :)

If they only tested the charge the alternator puts out and it passed they most likely bypassed the voltage regulator. If the voltage regulator is bad then you will still need a new alternator.
follow the link below and read the full field testing portion for a better explanation if you dont understand my explanation.

anything else? just post it :)

http://books.google.com/books?id=3q85p56_PxIC&pg=PA84&lpg=PA84&dq=test+voltage+regulator+inside+alternator&source=bl&ots=neLFU7USZK&sig=fmzJ2GjbxqULa9pU2UHylJahYS0&hl=en&ei=r9bySvXhNo2Xtge89omuAw&sa=X&oi=book_result&ct=result&resnum=5&ved=0CBIQ6AEwBA#v=onepage&q=test%20voltage%20regulator%20inside%20alternator&f=false

Nov 04, 2009 | 2005 Ford Focus

1 Answer

Electrical/Battery Light


Hi,I am Ron,Look at the alternator out put voltage,and have the battery load tested.Also check bad connection from battery to alternator(this is the large wire/cable).alternator turns the battery light on,why?You need to figure out witch one.A diode could be going out in the alternator,diodes change ac voltage to dc voltage ,that`s why the call it a alternator(alternating current)AC voltage means alternating current. If it goes unrepaired it can ruin battery,changing battery voltage from 12 volts dc to 12 volts ac.Also there is a built in voltage regulator that holds voltage down to about 14 volts charging while car is running.Voltage regulators can cut off charging completley or open wide allowing alternator to charge as much as 18 volts dc,ruining battery(boiling battery acid out of battery)and ruining alternator by burning fields and rectifiers out.So have it checked or do it your self.Auto parts stores can check alternator and battery.If I can be of more help,please ask.roniecon@gmail.com

Jul 19, 2009 | Ford Five Hundred Cars & Trucks

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