Question about 1993 GMC Sierra C3500

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Batteries won't charge

Brand new batteries. Advance said alternator is fine. both batteries read about 11.5 on voltmeter. used voltmeter at alternator plug and got a reading of 1.65 topped out. Alt. bad or batteries bad?

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  • Master
  • 2,101 Answers

Sounds like the alternator

Posted on Nov 07, 2012

6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Battery light still on after changing alternator and battery.

i have a 2003 chevy silverado the riverse has not worked for 10.000 miles any sugesstionswhat this might be and or how much.

Posted on Jul 15, 2009

  • 37 Answers

SOURCE: new alternator, regulatoer, ternsioner etc.

check the belt first

Posted on Dec 12, 2009

  • 121 Answers

SOURCE: Jimmy would not start, voltmeter read 9. After

sounds either like your alternator is bad, if it still goes dead then i would go with the alternator, other wise a cell or two could be bad or shorted in the battery.

Posted on Jun 25, 2010

Testimonial: "I'll try a battery first although it's only 2 years old."

SOURCE: Hi! I have a gmc

That is correct! Your alternator isnt putting out the necessary voltage/amperage to keep the battery light off.

Have the vehicles charging system checked at a local parts store. They can also do a free load test on the battery. Just to be sure.

Posted on Nov 01, 2010

  • 279 Answers

SOURCE: I have an Intermittent charging problem. It seems

I have been sitting here for about ten minutes rereading your problem and the one thing that I am not clear on is does the voltage actually drop or are you taking the gauges reading and assuming that it is accurate? Does the battery drain if you continue to drive the truck to a point that the battery goes flat? If you have a meter that will read volts DC take the truck out and run it till you get the problem happening.Pull over and read the voltage at the battery terminals.It should be between 13.2 and 14.4 volts DC .If it is the gauge has a feed problem,like a bad wire.This bad wire will heat up,after the truck is running for a few minutes,because of the resistance in the wire, and the voltage reading will drop at the gauge ,which in turn will trip the battery
light.I'm trying to think outside the box here with the information posted,hope my speculative ramblings might give you another direction to look at.Good luck and if you get a chance let me know how you make out.

Posted on Nov 17, 2010

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1 Answer

Check gauge/low voltage


May or may not throw a code, have you had the alternator checked, this sounds like a bad alternator and also you charged the batteries but have them tested also, this sounds like an alternator problem.

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Hi it is possible that you Alternator is faulty,if you have access to a VoltMeter ,check the battery voltage in the morning before you try to start it you should have around 12.7 volts for a charged battery if not fully charge your battery again and check the voltage with your car running you should have around 14 volts with the engine reving at 1500 revs.ifyou get around 12 volts then your lights are taking more power from the battery than the Alternator can replace.You could also get your local garage to Drop Test your battery to see if any of the Cells are faulty

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The 60amp fuse probably is in the circuit between the alternator and the battery. Which would be why the battery is not getting charged.
Someone would need to check for a short in the wiring between the alternator and the battery.

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Battery wont charge alternator seems fine


As long as the alternator seems fine, I wouldn't worry about it. The problem will probably go away after awhile...HA HA, THIS IS A JOKE, from your statement that alternator seems fine. No rudeness or judgemental attitude intended.
Do you have a friend or know someone who has a voltmeter? It would take two minutes to put a voltmeter on the battery while the car is running, and it would tell you if the alternator is working as it should. If the voltmeter says over 13 volts (typically about 13.5 volts, up to 14.5 volts) then the alternator is good, and the problem likely is poor, corroded, or loose battery connections, or the battery may be too old to take a full charge, or may have a dead cell.
If the voltmeter says less than 13 volts (when car is running), then the alternator belt may be too loose, or you may have a loose connection on the alternator, or there may be a blown alternator fuse in the power distribution center near the battery, or the alternator is just too weak or malfunctioning and needs replacing.
Good luck, harlock6, I hope you find the problem. You can buy a perfectly good voltmeter just about anywhere for less than $20. Even the older analog type (with the sweep needle) would work for testing your alternator enough to know if it's working or not. More thorough tests of the alternator's actual amperage output could be performed (like a load test) with more expensive testing equipment, but you just need a voltmeter to check if the alternator is working or not.

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Dead battery, replaced battery and alternator but still no charge!


if its not charging while running at14.5 volts or so you have a charging problem mabey no power to the alternator if its charging at 14.5 or so and the batery load tests good and its going dead over night you have a draw from some component in the system.

Dec 19, 2011 | 1994 Oldsmobile Cutlass Ciera

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My battery dies i replaced a brand new alternator but still dosen't charge tomthe battery


The battery most likely has dead cells and not charging due to the alternator .The alternator is doing what it should, your battery just can't hold the charge the alternator is putting out. Go have the battery tested at a local auto zone or advance auto store. Free to check

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1 Answer

Alternator over charging


The alternator is vital part of your car or truck's electrical system. When the vehicle is running, the alternator provides a constant charge to the battery, as well as to other accessories. Without the alternator, the battery will eventually discharge. However, if the alternator isn't working correctly, it may send too great of a charge to the battery, which is known as overcharging. This condition is dangerous to your car's battery and electrical system. You can test to see if the alternator is overcharging, using a simple voltmeter. Start your vehicle and open the hood. Be aware of the moving parts within the engine compartment, as you do not want to get your hands or tools anywhere near them.

  • 2 Locate the vehicle's battery. It may be obscured by protective shields, the air filtration or intake system or a fuse box. Whatever the case, you need to remove everything that covers the battery. You must have access to both the negative and positive terminals of the battery.
  • 3 Turn the digital voltmeter on and adjust it to the proper settings, if necessary. The voltmeter must be set to "DC" and 12 volts.
  • 4 Connect the clamps or leads of the voltmeter to the battery. You must connect positive to positive and negative to negative. The positive lead is usually red or yellow, while the positive terminal on the battery will be marked with a plus sign. The negative lead on your voltmeter is black, while the negative battery terminal is marked with a minus sign.
  • 5 Examine the voltmeter. If you've hooked it up properly, you should see a reading somewhere between 13.6 volts and 14.3 volts. A reading higher than 14.4 volts warrants further testing by a professional. If your alternator is found to be overcharging, you will need to have it replaced.
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