Question about 2001 Chevrolet Express

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2001 Express 2500. Voltage meter in dash reads low (12v). Replaced alternator. Problem remains. Happened during very cold weather. -30C. Vehicle starts ok when battery is charged. Runs smooth.

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  • Anonymous May 13, 2009

    i thought the alternator was the power supply

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  • Master
  • 4,669 Answers

Check power supply to alternator. it might be a blown fuse from the old alternator or you might have purchased another bad alternator.

Posted on Feb 27, 2009

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How to tell if alternator is gone on 2000 protege


Hi John, The easiest way to check the alternator is to connect a voltage test meter between the positive and negative battery terminals. A fully charged battery should give 12 and a half to twelve and three quarter volts. Have some one start the engine (making sure the vehicle is in neutral or park and with the park brake fully applied). Voltage during start should not drop to lower than eleven volts. With engine running the voltage reading should be around thirteen volts. Turn on the head lights (full beam) and the heated rear window. The voltage should be maintained or increase slightly above the previous reading. If during start up the battery voltage dropped below that stated earlier the battery will probably need replacement. If the voltages remain constant or drop during the engine run, and if voltage drops below pre start conditions, the alternator requires attention. Regards John

Dec 09, 2012 | 2000 Mazda Protege

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Check your fusible links leaving positive side of battery,wires could be swollen or burnt on the inside.

Oct 15, 2012 | Cars & Trucks

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My abs light and my battery light is on. new battery ran down in less than an hour.


check for voltage from the alternator, charge the battery ,, with a multi meter set to DC volts ,, check voltage, you should have a reading just a little over 12v dc, then start the car,, check again, you should get a reading between 13.5 volts to 14.5 volts , if you have that your alt is good,, if not Its not charging the battery as your driving, having a low battery makes the computer go crazy and it looks for anything wrong,, Ive had dash lights for everything light up ,

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07 chevrolet trailblazer charging problem, When it is above idle charges fine as soon as it drops to idle shows complete discharge. Alt. replaced Battery new, all the obvious,blah,blah,blah. Took it to the...


Hello! There are several possibilities...A Technical Service Bulletin written on July/08 shows the existence of the problem...Yes, they know about it and nothing more...It is TSB# 02-06-03-008D...

The meter in the dash is telling you "complete discharge", correct? When the idle drops are there any other signs...ie...Lights dim for instance...Or is the only indication of a problem the meter?...Lets eliminate the meter itself...There is a blocking diode installed in the instrument cluster that may be defective and actually the discharge is a lie...Using a voltmeter, Read the battery voltage with the engine off...Record reading...Start the engine and at idle take another reading...Voltage should be 1,8 to 2 volts higher...Increase RPM'S...Does the voltage rise or remain the same...Send readings...

The ground strap from the -battery terminal to the engine block/chassis may be corroded or loose causing a voltage drop at low RPM'S...Set scale of meter to X1 ohms...Engine off...Place one probe on the CENTER of the - battery terminal the other on the alternator mounting bracket...Must be zero ohms...Dead short...Send readings...

The Regulated Voltage Control Module is defective and needs to be replaced...Regulated voltage control is new for the Vortec 4.2L and Vortec 5.3L engines. It enhances fuel economy by reducing the load on the engine generated by the alternator...It is located on the center tunnel under the rear seat...Check the connector to see if any pins are bent and that it is properly seated...

guru......saailer

Jan 10, 2011 | 2008 Chevrolet Trailblazer

1 Answer

My chevrolet 2500 diesel dies on me while i am driving. i am able to start it up but it will die again. i replaced the left battery and it worked for a while fine but then it started acting up again. what...


Possibly low battery voltage due to low or no alternator output. Chk Alternator output. The reading should be between 13.6 and 14.2. Tlower the voltage, the higher the amos be put into the batt. With a meter, chk the volyage at the battery terminals. Do not run the engine with any cables disconnected or damage mat be caused to the alt. _good Luck -Ned-

May 29, 2010 | 1995 Chevrolet Silverado 2500

3 Answers

When the Jeep was new the volt meter read 14 volts....now the volt meter reads 13 volts with a one year old battery. Since the battery is a 12 volt battery should there be any concern that the volt meter...


It needs to be looked at,hook a volt meter to the battery,and start the engine,turn the ac on high blower,and the head lights on,the alternator should be putting out 13.65 volts to 14.25 volts,if it is any lower than this,replace the alternator,now,if the reading is not the same as in the vehicles volt meter,then the cables,positive and negative need to be replaced,the cables get old,and corrode on the inside and break down,they do not carry the current as they should.Shuold you decide to replace them,go with a larger diameter cable,both positive,and negative.

May 28, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Car sat for 18 months, the battery died so i replaced it, after this the radio didn't work (maybe when i replaced it i shorted something out?) it ran for a while, but when it was driven at night the airbag...


All of these are signs of a dying battery, because it's not recharged by the alternator.
Test the alternator this way: jump the battery from a running car and start your engine; rev the engine to about 2500 rpm and disconnect the jumpers; test the voltage - on a working alternator it should read 14 to 14.5 volts; if it shows 12 volts or less then the alternator is totally dead.

Mar 20, 2010 | 2001 Hyundai Elantra

1 Answer

Everytime the weather gets cold the car drains its battery. Already replaced the battery.


2004 or 2005 model?

Two main root cause to be investigated.

First make sure your alternator provides enough voltage to take in charge the demand. In cold weather condition, running with heater fan, headlamp, rear defrost and so and so increase the load and maybe your alernator is not enough sufficient. The engine running, it should provide more than 13.5 volts (more around 14 volts) to provide power to the ignition and the different accessories turned on and keep your battery at its full charged level. If the alternator is not charging enough, then your battery has to provide power during your running what is not supposed once the engine is started. So, test your alternator with a voltmeter at different occasions: engine cold, engine hot... it could be an intermitent and not a hard problem. However, if the system is not charging enough, after a certain time you should get a red light turned on in your dash or you should read a low charge if you have a needle indicator in your dash.

Second, battery could be drained by a short somewhere during the vehicule is sleeping. Trying to isolate what circuit or accessory could be defective try to remember if a repair or modifications has been applied previously to the beginning of your problem. Vehicule accident? Radio replaced? Alarm system installed? Trailer hitch connection installed? Remote starter installed? If yes, your problem could be related to one of these modification.

If not, did you detect any other malfunction such defective horn, defective light inside or outside the vehicule, defective switch or control, defective power outlet, rear window defogger, electrical mirror, abs brake ... If yes, once again your problem could be related to one of these points.

If you suspect something, remove the fuse of the associated circuit during night or weekend and see if it makes a difference.

If this process didn't allow problem resolution, then a more in depth testing of electrical circuit by circuit will be required to identify the short root.

I read that few owner had similar problem and was related to their radio/sound system and have it replaced. Maybe something to chek more in depth.

Hope it will help
Dan (sorry for my poor english)

Dec 04, 2009 | 2004 Hyundai Tucson

2 Answers

2001 chevy silverado 1500 v8 battery drain after sits for 1or2day


, do a simple test on the charging system...check battery voltage. should be 12v or better. start engine & check volts at idle, no accessories on. volts should read 13.5 -14v. Turn on all accessories(including headlamps on high) volts should drop slightly but should not creep down. Definitely not below 12.5. If voltage drops lower than 12.5, the regulator (in the alternator) is not working. either change regulator or change entire alternator. Alternator drive belt should have sufficient tension so that alternator cannot be turned easily by hand. If it can, check belt tensioner.

Mar 18, 2009 | 2001 Chevrolet Silverado

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