Question about 1990 Oldsmobile Regency

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Voltage regulator is putting out 22 volts what is my problem?

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The alternator is shot , change it asap as will fry the electronics at that voltage

Posted on Oct 05, 2014

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It could be that your alternator has an internal short or you have a loose connection between the battery and the alternator. It could also be in the ECM if the vehicle is new enough to have that type of voltage regulator.

Posted on Apr 21, 2014

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2 Answers

I have a 1991 chevy s10 that i had to replace the ignition control module, was wondering if a bad voltage regulator might have caused the ICM to fail!!!!


I also have a 91 S-10 and have recently had to replace my ICM i really think that it's due to high mileage and just wore out more than anything else

Feb 25, 2013 | Cars & Trucks

1 Answer

How can i know if my voltage regulator is working, Im not getting any of my lights to work


quick check is to remove a battery cable while the motor's running. If the motor stays running when you pull off the battery cable, the charging system is functioning properly, if it dies then there is a problem with the charging system. Don't leave it off long, as this test is stressful to the circuit. You can test the voltage regulator by putting a volt meter across the battery posts to verify voltage. A fully charged 12 Volt battery should show slightly above 12 volts DC. With the engine running and the volt meter hooked to the battery, the charging system should be showing around 13.8 volts DC.

Dec 02, 2012 | Cars & Trucks

2 Answers

2004 sprinter headlights keep blowing out


Hi, what voltage is the alternator putting out? Put a voltmeter across the battery - it should be reading between 13.8 to 14.4volts. Any more than this and the regulator unit on the alternator is likely to be faulty. Normally a cheap fix

Aug 25, 2012 | 2004 Dodge Sprinter

1 Answer

My 2005 Pontiac Sunfire has had several problems over the past couple of months. When I was driving all my gages went to zero when I would start to break. After I started moving again they would go up....


Your car's symptoms (voltage fluctuations under load that shouldn't happen) seem to
strongly indicate that your voltage regulator has failed. The voltage regulator is the component
that regulates voltage coming from the alternator, and which is supplied to the rest of the car.
Your new belt tensioner indicates to me (and should have to your mechanic) that the
alternator and/or voltage regulator weren't able to operate properly, and a faulty belt tensioner
has killed more than one car's alternator/voltage regulator.
Your do not need new headlights. Do fix the turn signals.

In the 2005 Sunfire, the voltage regulator is an integral component of the alternator, and is
not separately serviceable. So your 2005 Sunfire needs a new alternator.

2005 Pontiac Sunfire Alternator - Duralast Part Number: DL2305-15-4 $199.99 available at:
http://www.autozone.com/autozone/parts/2005-Pontiac-Sunfire/Alternator/_/N-jmqtpZ93xme

The national parts chains (Advance Auto Parts, AutoZone, Pep Boys) will (for free) administer
a "Charging System Test." Which will telly you for sure that your alternator/voltage regulator
is bad. Do this before replacing alternator, since its a pricy part in the 05 Sunfire.

Just in case, Here's the 2005 Sunfire manual entry on (a) Diagnosis & testing the alternator, and
(b) replacement of the alternator

Alternator replacement is a do-it-yourself project, though you may need to get a
"Serpentine Belt Kit" on your favorite parts store's loan-a-tool program to remove/re-install the serpentine (drive) belt.
======================================================================
Diagnosis & Testing - 2005 Pontiac Sunfire Alternator


Alternator Load Test

1. With the engine running, turn on the blower motor and the high beams ( or other electrical accessories to place a load on the charging system).

2. Increase and hold engine speed to 2000 rpm.

3. Measure the voltage reading at the battery.

4. The voltage should increase at least 0.5 volts from the voltage test. If the voltage does not meet specifications, the charging system is malfunctioning.
NOTE
Usually under and overcharging is caused by a defective alternator, or its related parts (voltage regulator), and replacement will fix the problem; however, faulty wiring and other problems can cause the charging system to malfunction. Many automotive parts stores have alternator bench testers available for use by customers. An alternator bench test is the most definitive way to determine the condition of your alternator.




Alternator No-Load Test

1. Connect a tachometer to the engine.
CAUTION
Ensure that the transmission is in Park and the emergency brake is set. Blocking a wheel is optional and an added safety measure.


2. Turn off all electrical loads (radio, blower motor, wipers, etc.)

3. Start the engine and increase engine speed to approximately 1500 rpm.

4. Measure the voltage reading at the battery with the engine holding a steady 1500 rpm. Voltage should have raised at least 0.5 volts, but no more than 2.5 volts.

5. If the voltage does not go up more than 0.5 volts, the alternator is not charging. If the voltage goes up more than 2.5 volts, the alternator is overcharging.
NOTE
Usually under and overcharging is caused by a defective alternator, or its related parts (regulator), and replacement will fix the problem; however, faulty wiring and other problems can cause the charging system to malfunction. Many automotive parts stores have alternator bench testers available for use by customers. An alternator bench test is the most definitive way to determine the condition of your alternator.


6. If the voltage is within specifications, proceed to the next test.



Voltage Test

1. Make sure the engine is OFF , and turn the headlights on for 15-20 seconds to remove any surface charge from the battery.

2. Using a DVOM set to volts DC, probe across the battery terminals.

3. Measure the battery voltage.

4. Write down the voltage reading and proceed to the next test.



Removal & Installation - 2005 Pontiac Sunfire Alternator


2.2L (VIN 4) Engines

1. Before servicing the vehicle, refer to the precautions section.

2. Remove or disconnect the following:

Negative battery cable

Accessory drive belt

Alternator mounting bolts

Alternator electrical connectors

Alternator





To install:

1. Before servicing the vehicle, refer to the precautions section.

Alternator. Torque the upper bolts to 37 ft. lbs. (50 Nm) and the lower bolt to 22 ft. lbs. (30 Nm).

Alternator electrical connectors

Accessory drive belt

Negative battery cable





2.2L (VIN F) Engines

1. Before servicing the vehicle, refer to the precautions section.

2. Remove or disconnect the following:

Negative battery cable

Accessory drive belt

Alternator mounting bolts

Alternator electrical connectors

Alternator





To install:

1. Install or connect the following:

Alternator. Torque the bolts to 16 ft. lbs. (22 Nm).

Alternator electrical connectors

Accessory drive belt

Negative battery cable

Sep 05, 2011 | 2005 Pontiac Sunfire

2 Answers

Where is the voltage regulator on a 99 mercury cougar?


The voltage regulator is a part of the alternator.If you are having pulsating issues then look for grounding issues like a corrided eyelet or loose grounding bolts.

Jul 20, 2010 | 1999 Mercury Cougar

1 Answer

Battery light came on, changed alternator, light comes on during high revs. battery only a yr old


You will need to go to a shop,have the out put checked,it is supposed to be 13.65 volts,to 14.25 volts out put at the battery.If it is over this,the voltage regulator is bad.The voltage regulator is in the computer.This is allowing the alternator to over charge.But make sure the belt is not slipping.

Jan 09, 2010 | 2002 BMW M3

2 Answers

Will not charge. replaced alternator, and voltage regulator. fusible link is good. battery tests good


good the alternator you installed be bad? if it tests good then theres a fuse or a wire thats bad, check links at starter and battery and alternator if it has them there,start there, i would first have that alternator tested.good luck. also check wiring to regulator had problems with that!!!!

Nov 14, 2009 | Lincoln Mark VII Cars & Trucks

2 Answers

Produce 24v 300amps of power from alternator w/out car engine


Yes, BUT, you better have a battery, or batteries installed in the system, that add up to 24 volts (I assume this 24 volt alternator has a built-in voltage regulator?)

If there isn't anything to 'tell' the voltage regulator, to just put out the needed voltage to keep 24 volts running smoothly, it will put out way more than that, And BURN up!

Aug 07, 2009 | Rolls Royce Camargue Cars & Trucks

1 Answer

Volt meter in s reading almost 16 volts


Your voltage regulator needs to be adjusted to 14.5 volts or if it won't adjust you need to replace the regulator. If you have a bad ground it could make the alternator see the wrong voltage and cause it to go to full charge. If it haas a built in regulator you can buy it at an alternator shop and replace it it is help in place by screws. It would be helpful if you tell us what year and make of car. Some put out as much as 26 volts. so more input is better, also please rate this if you need more help.

Jul 15, 2009 | 1987 Nissan King Cab

1 Answer

Alternator putting out 16.5volts


or and more likely... the voltage regulator either mounted on the alternator or on the wheel well is defective.

Feb 26, 2009 | 2003 Chevrolet Impala

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