Question about 2004 Chevrolet Silverado 2500HD

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Alternator my alternator was not charging so i just replaced it now my volt gage keeps fluckuating up and down could i have got a bad one i check all my connections they are clean and good along with the belt . what could it be

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  • hs4smith Apr 19, 2009

    I have a 2003 1500HD 6.0. Battery went dead with no warning. One day everything was great, the next morning not enough juice to start. So, I replaced the battery...next day I jumped in the truck to go somewhere. First full stop and the truck acted like it was going to die (surging,starving for fuel). I ran to Autozone and they checked the alternator, sure enough it was bad. I replaced with a NEW not rebuilt unit and now the volt meter fluctuates between 12.5 and 14.5. Also, it has surged a couple of times. Like there isn't enough juice for the coils to fire properly or it's starving for fuel. I haven't had a code pop up so I'm at a loss. I had a 2001 1500HD and the thing seemed to maintain a charge of 14 volts all the time. Not sure where to look next.

  • rechanic May 11, 2010

    duramax?

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You need to verify you replaced with the correct amperage alternator, I went to AutoZone with part in hand for my 2004 2500HD Duramax and they gave me the incorrect one, had the exact problem you describe, installed the greater amperage alt and all is well for 10000+ miles now.

Posted on May 01, 2009

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I replaced alternator on my 01 dodge stratus, but car still isn't putting off enough volts to stay running..do i need to reset the comp code? Or is it something else?


Did you test for B+ voltage at heavier gage wire on the back of the alternator ? Also pin 1 at the connector, a orange with dark green stripe wire should have B+ voltage . Fuse #25 20amp in the under hood fuse box. The heavier gage wire has a fusible link in the wire , comes from starter solenoid . The last wire in the connector , a dark green wire comes from the PCM - engine computer . You can replace the alternator how ever many times you like , but if there is any B+ voltage at the place's I mentioned it's not going to charge ! Plus if the PCM is turning it on it's not going to work . There are videos on youtube for testing charging systems.

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Hooked up my new battery backwards, blew the main fuse. It has been replaced and now the meter fuse in the inside fuse box blows within seconds and gage cluster and alternator not working


Could have damaged regulator. When the car is running have you checked the voltage at battery terminals. If battery is charging it should be around 14 volts. If around 12 your charging system is fubar.

Meanwhile if you have to charge the car every day then something in the car is draining the battery, Using an ammeter you need to track it down, Hook it up to battery and pull fuse out one at a time till the drain goes down. That isolates the circuit with the problem.

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I would say that you have a bad battery . If the alternator is charging ok but the battery is bad all the current will go to the dying cell . Have a load test done on the battery to eliminate it as a source of a problem. Next have the alternator bench tested as there may be a problem in the rectifier pack

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if battery keeps running down. check the voltage across the batery posts while car is off.should be around 12.5 to13 volts. then with tester hooked up to battery, start the car. if alternator is ok, it while read about 14 volts give or take a few volts. if the gharging is low its a bad alternator or the drive belt.

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2002 mercury montaineer , battery light comes on , they gages shut down couple minutes after then the truck acts like it gonna shut off....when getting a jump, the truck fires right up, couple minutes...


Your battery is definitely low. First clean the terminals on the battery and the inside of the terminal rings on the wires. If you have a slow charger put it on that overnight and see if it holds a charge. If it still keeps depleting or doesn't charge overnight then either your battery or your alternator are done....possibly both. So take the battery to have it load tested. Most places that sell them can test them. If the battery is done replace it then test the battery with a volt meter. If the old battery is still good put it back in the vehicle and test the voltage with a volt meter. With the engine off the voltage should read 12 volts (once its fully charged or if its new) with the engine running it should read around 14 volts. If it is way higher than that or it doesn't go up at all your alternator requires replacing. Alternators are fairly easy to replace but if you don't feel comfortable with that take it in to a mechanic.

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1 Answer

Alternator not charging the gage saying not charging but charging 9 volts had alternator tested its charging 14-15 voltes its got a new battery not charging good enough


ALTERNATOR DRIVE BELT SLIPPING OR BATTERY CABLES NEED REPLACING IF THEY ARE THE ORIGINAL ONES.THE VOLT GAUGE COULD BE FAULTY.TO TELL GET A DIGITAL VOLTMETER HOOK TO CAR BATTERY CRANK CAR UP.BATTERY VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS. WITH NEW CABLES. IF NOT CHECK ALTERNATOR FIELD WIRES FOR DAMAGE ALSO ALTERNATOR POSITIVE WIRE FOR DAMAGE.

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Hi:
The battery light means that your charging system isn't working, so you most likely have a bad alternator, or connection to the battery.
You can test your alternator with a volt meter.
First,get your battery 100% charged up. It should read about 12.6 volts.
Next, start your car, and check the voltage across the battery. It should be at least 14 volts. If not, you are not charging your battery.
Most auto parts stores will check out your battery or alternator for free, if you stop by and don't own or can borrow a volt meter.

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2 Answers

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Sound's like a bad alternator, you can check the alternator by measuring the voltage on the battery when the car is started, it should measure above 12.6 volt's but not higher than 14.5 volt's, check the drive belt tension, a lose or wore drive-belt could cause problem's with the alternator charging the batery, check the battery terminal's for corrosion, along with the connection's of the battery cable's.
Hope this help's, good luck.

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need to have alternator output checked. sounds like the voltage regulator is going out. this is inside alternator.if it starts charging this high it can blow your bulbs and damage computers

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