Question about 2002 Chevrolet Suburban 2500

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The voltmeter on my 99 Suburban keeps drifting towards the 9-11 range; it normally stayed right at 14 (in the middle). The battery & alternator check ok. Do I have a short somewhere?

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CHECK ALT AND BELT.

Posted on Jun 28, 2009

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My battery keeps dying which I have replaced twice in 14 months. The alternator was tested and this is not the cause? Any suggestions would be greatly appreciated. Thank you


Not everyone knows how to test alternators adequately ... but that is not to say that whoever tested your alternator did anything wrong either!t

One of the most annoying situations to have in any vehicle, is a mystery drain on the battery. It could be something as simple as a light not turning off somewhere. A trunk light that stays on, a glove box light, or any other lighted enclosure, an under-hood light, or perhaps even a defective phone charge cable that draws current even if the phone is disconnected!

If you have a voltmeter anywhere, connect it across your battery, AFTER setting the correct range and function on the meter. The voltage will be 14.2 to 14.6 VOLTS (NOT AMPS!!!) with the meter connected across the battery terminals, the engine idling, and as many things turned OFF as you can control. If the voltage is 12 point something, when idling, either the alternator is defective or not turning!

Any multi-function meter you get will probably have some current ranges. If you are not afraid to, you could (with the engine off and cooled off), DISCONNECT one battery terminal. Then connect your meter (as a CURRENT meter), in series with the disconnected battery terminal. Read the meter, and that will tell you IF you have a drain on the battery, and how much drain (in amps).

Such meters are very low cost at places like Harbor Freight Tools! Well under ten bucks!

Apr 17, 2017 | Cars & Trucks

1 Answer

71 c10 not staying charged... new battery alternator fuses good and new voltage regulator


Maybe it wasn't running long enough to charge up the battery?
Stop trying to jump it, when you are having problems with it dying, take the battery off and have it charged. And/or buy a $20 voltmeter to see what the battery shows. If it says less than 12 volts, it is discharged, and needs charging. A good battery that is not run down should have at least 12.5 volts. A new battery that is charged should have very close to 13 volts, maybe 12.8 volts.
When you have the truck running, check the alternator for charging. You put the voltmeter right on the battery and check it again. This time, with truck running, battery should show at least 13.5 volts. That shows the alternator is working. A good alternator will put out about 13 or 14 volts-the regulator will keep it from going any higher to prevent problems, like a melting battery or electrical parts burning out.
I would say get the charging system working right, then address the problem of dying at stop lights. That could be a carburetor problem, if the alternator is working.

Aug 15, 2013 | Chevrolet Cars & Trucks

1 Answer

Replace voltage regulator 2000 suburban 1500


You don't say what year your truck is but since the 70's the alternator and voltage regulator are housed together. Use a voltmeter to check the output from the alternator to a good battery when running it should be putting out 13-14 volts if not there is your problem.

Jan 17, 2013 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Changed out alternator and still has a problems charging


One way to be sure the gauge is right is to put a voltmeter on the battery with engine running. If the voltmeter reads under 13 volts, alternator is not working. Voltmeter should read 13.5 volts up to about 14.5, in that range. If the alternator is not working, check for a blown alternator fuse in the power distribution box, and recheck alt. and batt. connections. A loose connection anywhere there will prevent alternator from working.

Dec 06, 2012 | Ford Ranger Cars & Trucks

1 Answer

How many amps on amp meter 1995 jeep cherokee


I think you are looking at the voltmeter, not the ammeter.

11 volts means the alternator is not charging if the engine is running. There are some conditions that exist in normal operation where the voltmeter can register 11 volts and it not be an issue, but if you are driving down the road, and only have 11 volts- the vehicle is running off the battery to keep the engine functioning for only a few miles more.

An ammeter in a car or truck has to be able to handle the full output of the alternator- which can range from 35 amps for some, up to 165 amps for others and higher. It is this reason ammeters in motor vehicles rarely have any numbers on them, just plus or minus sign, or the words charge discharge.

Feb 07, 2012 | 1995 Jeep Grand Cherokee

2 Answers

I think I have an alternator problem? The charge needle on the dash guage is spiking to 16 volts off and on. I put a voltmeter to the battery and it is only charged to about 11 volts. With the engine...


Hello
The normal charge of alternator on idling is about 13 to 14 volts. 12 is acceptable but keep in mind it will need attention soon. The needle fluctuates due to the revs of the alternator - there is nothing to worry about. Just look that the charge is always above 12V on idle.

Jul 14, 2011 | 1996 Dodge Intrepid

2 Answers

Why does the battery light stay on all of the time


Hi, the battery light indicates your alternator is not charging. If you have a voltmeter, check the voltage at the battery with the engine running. If the voltage is less than 14 or you don't have a voltmeter, remove the alternator and have it tested at your local parts chain. Please let me know if you have more questions, and thanks for using FixYa.

Apr 02, 2011 | 1997 Mercury Grand Marquis

2 Answers

Battery light stays on


alternator has likely failed. Check voltage at battery with engine running. Should be at least 14 volts. If you don't have voltmeter, remove alternator and take to parts store for testing.

Oct 11, 2010 | 2005 BMW 3 Series

1 Answer

'06 Sedona battery light comes on. Low voltage indicated on radar detector. Battery was replaced ...2 days later the same problem. When battery was replaced, I unhooked batt connectors and van still...


It can still be the alternator, the alternator can produce enough to keep the car running, but it may not have enough to keep the battery charged 13-14 volts. It don't take long for a new battery to drain if the alternator isn't putting out the right voltage. Find a voltmeter and check the output from the alternator to see what voltage is being produced. If it's not at least 12.5 -14 then have the alternator checked out.

May 16, 2010 | 2006 Kia Sedona

1 Answer

1194 chrysler town and country 3.8L 2wd, code 41, LED gauge reads


I definitely agree with motor1258's suggestions, but from the trouble code you got, it sure sunds like an alternator replacement is in your future. If you have a voltmeter, and the battery has enough charge to start the vehicle, you can check the battery voltage with the vehicle off, then start the vehicle and check voltage at the battery terminals again. If the voltage readings are essentially equal, the alternator is not charging the battery. (Voltage at the battery posts with a good alternator should read around 14 volts.)
I would not pull a used alternator from a 14-year-old vehicle to use as a replacement, no matter how "new" the salvage vehicle looks. After all, you'd probably get a 14-year-old alternator.

Dec 20, 2008 | 2005 Chrysler Town & Country

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