Question about 1999 Subaru Legacy

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I've replaced my alternator (with regulator built int) 10 months ago, now the battery is running to hot again, and everyone is pointing to the alternator. Is/can there be another Something, making the NEW battery charge too high? I never leave radio, lights, etc., on, as I haven't towing. what would cause the battery to overcharge again, and OH it's eating my car up!thanks.

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The voltage regulator which is usually built in to the alternator.

Posted on May 30, 2010

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2 Answers

Voltage regulator


Sounds like a bad connection. The alternator only charges the battery, so if it or the voltage regulator in the alternator fails, the battery would slowly run down, not die all at once.

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All I can tell you is that when the regulators in the PCM mess up, the alternator usually will not charge at all.

I do not know what you mean by "all over the place", but I can also tell you that if your charging system voltage is really erratic, like 12 volts one minute and nearly 15 volts the next, it is usually caused by a shorted (oe sulfated) battery cell. A shorted cell will cause the alternator to "full field" and make the whining noise you are describing. Also, shorted battery cells are what usually causes the early death of many alternators.

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Alternator problem,battery light came om a year ago,i have tested the output .At that time it was ok 14.2 volts so i have replaced the battery.But this problem is back and on for a year.Charging sometimes...


check the earths on the engine and the shell, usually do this if the earth id not good. regulator is built into the alternator. no others needed. depending on the voltage stated on alternator should be 14v plus minus 2. battery should be 12.06 or 8 if brand new,

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I have a 1993 GMC 4x4 350 suburban that keeps discharging the battery. I have replaced the alternator and still discharge the battery. I was told that it needed a voltage regulator but can not locate where...


The voltage regulator is built into the Alternator. Take out the Alternator and have it
tested at your local Auto Parts store (they all do it free). This will tell you if the Alternator
is your problem or if you need to check elsewhere.

Mar 26, 2011 | 1993 GMC Suburban

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99 aurora, change alt 2 months ago now its over charging 16.7


That's fine this happens i have gotten from 30 minutes to a week out of rebuilt alternators up to 10 years 2 months ago you should have warranty on it contact supplier.

Jan 05, 2011 | 1997 Oldsmobile Aurora

2 Answers

How do i test my alternator to make sure it still works good


Start the engine and turn on all your lights and your a/c blower on high. You should have 13 to 14.5 volts at your battery, if you have less then 13 volts. Then you have a weak alternator or faulty voltage regulator, to test the regulator, turn everything off and check the voltage again with the engine running. You should have 13 to 14.5 volts again, if anything different as to being too high or low, then you have a faulty regulator which is built in to the alternator so your still going to have to replace it. To test the battery, you should have 11.5 to 12 volts with everything off and engine not running.
Good luck and hope this help. A battery older then 4 years may no long be able to hold a charge and will need to be replaced. A bad battery will cause the alternator to fail much quicker then a good battery.
Thank you for using Fixya

Mar 16, 2010 | 1995 Chevrolet S-10 CA Edition

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Flickering headlights. the lights dim in and out while the vehicle is running the lights dont flicker right away it takes about 5-10 of running them n then they flicker and cut off and on. the wire is...


Go to Autozone or Oreillys for a free scan of both the computer and the alternator. It sounds like a Regulator is bad. There reason it works well the first 10 minutes is that the battery is recharging and the Alternator is steadily charging via the Regulator. Then when the battery is charged the Regulator is tapering the charge and providing just the amount of energy your car needs.

This provides an off-on cycle which is the flicker you notice. It is not normal to show up and should be seamless. You may have the type of Alternator with a built-in Regulator and will have to open the Alternator or replace it to change the Regulator. There may also be a Headlight relay they mentioned, but if you notice the flickering in the overhead Dome light with the engine running at different speeds it is more likely the Regulator.

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1 Answer

2006 uplander replaced battery month ago then replaced again yesterday cuz it was leaking now new battery is leaking and car has a misfire code


check your alternator.if it is overcharging it can cause the battery to leak. IT should be built into the alternator, however if it is not have the voltage regulator checked as well. After you do this reset your computer and if the cylinder misfire code returns you will need to inspect your plug and coilpack/wire.

Oct 14, 2009 | 2006 Chevrolet Uplander

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