Question about 1998 Mazda Protege

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Voltage regulator replaced altenator 3 times still not charging the baterry was told it might be the voltage regulator but where is it located?

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  • Anonymous Nov 23, 2008

    we have the same problem you are having on our 92, changed alternator twice and put new battery.



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Voltage regulator is built-in to the alternator assembly.

Have you tried replacing the battery?
A battery with a shorted cell will not charge properly and may even damage an alternator or regulator.

Note1: use a digital voltmeter (about $25 at Lowe's or Radio Shack) and check voltage across batt terminals while engine running. If more than 12.6 Volts DC and more typically about 13 Volts, then the alternator is working.

Note2: from Jan 98 to May 98 shows a different part # alternator than June - Dec 98
check the manufacture date on your driver door edge.

Posted on Oct 25, 2008


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" HI " Where is the Voltage Regulator Located on a 2002 Dodge Stratus R/T 3.0

The way to check for an over or under charge is to connect your volt meter to the battery, before starting the vehicle.
You should have a reading of 12.5 to 13 volts. If it's 11.8 like you stated or less, it means battery is not fully charged, or it's bad. Now start the car & check voltage again while running the engine, the voltage should exceed 14+ volts, this means your Alternator is charging, the voltage should drop after battery has been charging for awhile. When you turn the engine off after letting it charge the battery, & if the battery is good, you should now have 12.5 volts to 13 volts.
Now to answer your question, the Voltage Regulator is inside of the Altenator, I believe you xcan take the alternator apart to replace it, or simpler to just replace the complete alternator.

Nov 15, 2014 | 2002 Dodge Stratus

1 Answer

Where is the voltage regulator?

the voltage regulator is built into the altenator,if you are having a charge problem, theres an easy way to check to see if it;s charging, while the engine is running disconnect the positive side post of battery, careful not to ground it to anything metal, if car dies,no charge from altenator, if it stays running,reconnect the positive post, if not you'll need to leave that disconnected to replace that altenator.if you need further assistance from fixya please post your question and we'll be happy to help you.thank you for choosing!!

Nov 21, 2010 | 1993 Dodge Dynasty

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My 1987 dodge w 150 wont hold a charge ive changed the alernator battery as well as the voltage regulator. when i charge the battery it holds a charge for about 5 to 6 starts

Could be a short. Have you checked the voltage at the battery with the car running? Is it over 14 volts?

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Oct 19, 2010 | 1987 Dodge W150

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Car starts most of the time but sometimes you have to wait 10 minutes before you try again, gauges always going crazy, car died going 50 mph, battery always tests at 12-13 amps alternator testing always...

your altenator has a built in voltage regulator in the back of it. suggest you replace the altenator to make the problem go away.the car will do all kinds of crazy stuff if it's not getting 12volts all the time, it won;;t get 12volts all the time because the regulator isn't operarating're running off the charge in battery most of the time because the regulators kicking in @ out after it heats up. hope this helps!!

Oct 03, 2010 | 1991 Chevrolet Cavalier

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I have a 2004 Mazda 6 with the 2.3 liter engine. I have replaced the altenator 4 times and the battery twice because the battery light comes on and the transmission shifts to the 3rd gear. When the...

Could be a eloctronics fault! Have a reputable do a diagnostics check, alternativ solution fit a Bosch replacement alternator.

Sep 12, 2009 | 2004 Mazda 6

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Electrical Problems

Al, this truck has a regulator locted inside the altenator, it also has a relay located in the power distribution box under the hood, see your owners manual for exact location, to verify an no charging problem, start the truck and measure the voltage at the battery, it should read 13.5v-14.5v, if not then the altenator is not working, most common problem is regulator failure requiring altenator replacement, hope this helps, let me know

May 26, 2009 | 1998 Ford F150 Regular Cab

2 Answers

Replaced the alternator 3 times still wont charge. new starter and battery. Voltage is still low. I was told to ground the field hole on the alternator it worked for a day and now it is back to not...

Either the voltage regulator is shot, or you have a short somewhere else that is draining the battery. How are your battery cables? Is the ground wire clean and securely attached? How is the altenator belt? Is it tight?

May 15, 2009 | 1989 Chevrolet Astro Cargo

2 Answers

Replaced altenator ,dummy light is off now but the baterry is not getting charged, also a new battery, is there possibly a fuse somewhere that blew when alt. went out. have had van for 1 mo. and it didnt...

When you replaced the Alternator were all the leads to it returned correctly? as this appears to be a Voltage fault. Some alternators need an exciting voltage of 12 volts+ to trip the regulator into charge. Is it the correct Alternator for that particular vehicle?
All though the ignition light is out does it come on in the first place?
Finally is this particular generator separated from the regulator? if external look for connection to it, if it is inbuilt then maybe there is where the fault possibly lies.
I hope this helped,
Paul 'W'

Jan 12, 2009 | 1998 Ford Windstar

1 Answer

My baterry keeps on going dead and i had the altenator checked and it passed

Here's the key parts of the electrical system.
Battery: the source of your electrical energy
Alternator: The charging source for the battery. Driven by the engines rotation via a fan belt
Regulator: tells the alternator when your battery needs to be charged and how much.
The Load: all of the devices that use the batteries energy

If you have replaced the battery 3 times we can rule out the battery as the problem
You had the alternator check and it passed. We can rule out the alternator
The load: It's fixed and for the most part you can control most of this with knobs on the dash
That leaves only the regulator. If the regulator is giving bad info to the alternator that could account for the problem.

Try this ( if you don't have a voltmeter, places like AutoZone can make these measurements)
Start the engine and measure the voltage at the output of the alternator. It should be about 13.5 to 14.0 volts. Then measure the voltage at the battery terminals. It should read the same as what you got at the alternator. If it's not,check the battery cables for clean bright connectors. Use a battery terminal brush to clean the. If this still doesn't help check the regulator.

Hope this helps

Good luck Loringh

Oct 22, 2008 | 2001 Mitsubishi Montero

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