alternator is not charging battery. i had it tested and it tests good.

10

Asked by Jul 28, 2014 at 04:52 PM about the 2003 Chevrolet S-10

Question type: Maintenance & Repair

I have a 2003 S10 with a Vortec V6. I was driving on the hiway when the battery light
came on and the truck quit. I put a new battery in and noticed that the volt meter was
showing that the battery was not charging. I removed the alternator and took it to be
tested. It tested good. I put it back in the truck and it started to charge again. After driving
for a few days I noticed that it had stopped charging again. The cables seem to be in good
condition. Any ideas?

15 Answers

116,335

It looks like your trucks charging system is computer controlled, have the engine control system checked, the fault might be in the ECM.

4 people found this helpful.
10

Can I check this on my own or does it take a professionals diagnostic system?

2 people found this helpful.
116,335

It will take some specialized equipment to make the ECM cycle the Alternator during the test, so a Auto tech would be a good idea.

1 people found this helpful.
Best Answer Mark helpful
10

Thanks for help.

19,865

Great advice "tennisshoes". Also have the battery tested. I don't know how old your battery is, but if it is original in a 03 vehicle, it may be bad. One cell will not allow it to hold a charge or even charge. You also may have a diode going out. Electrical that gives problems intermittently is a B to locate and fix unless it is tested by good diagnostic equipment not normally found in a home garage.

1 people found this helpful.
60

my s 10 is charging went it start but as i am driving it it stop charging as i step on the gas i let go of gas and it start to charge and it dose it all the time now

6 people found this helpful.
116,335

So either the belt is slipping under load or the alternators internal regulator is starting to fail and I have seen a flying open do the same thing, works at low RPM but the circuit open when RPMs increase it shuts down.

1 people found this helpful.
10

I took it to a Chevy dealer and had it diagnosed. The alternator was bad.

Mine is doing the same thing. almost 100 percent sure it's an alternator. Pain to remove it from the side of a wheel well

70

Ugh big time charging problems with 2001 Chevy S10 2.2 liter. Alternator tested bad. Installed a new alternator worked for 2 days quit charging. Checked all cables and connections. New alternator was bench tested and was good Reinstalled and same problem not charging .Checked fuses and can not find anything. Any suggestions? .

6 people found this helpful.
116,335

Is the ECM turning on the alternator?

1 people found this helpful.
70

Not sure I had 5 volts on the small red wire. I gave up and took it to a shop to trouble shoot. I let you know what they find out.

1 people found this helpful.
20

did u ever figure it out im havin same problem my battery is good and alt is good checked fuses they good

2 people found this helpful.

Start the engine and disconnect the positive battery lead. If the engine quits, that means the alternator is not generating enough power to run the engine either because the alternator is bad or the ecu is not telling the alternator to put out enough. To check the latter have a full field test done on the alternator at your service centre.

116,335

Never ever do that unless you have a lot of money laying around for electronics replacements.

Your Answer:

S-10

Looking for a Used S-10 in your area?

CarGurus has 880 nationwide S-10 listings starting at $1,500.

ZIP:

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    2,810
  • #2
    John Saffrahn
    Reputation
    1,110
  • #3
    Trebor66
    Reputation
    1,090
View All

Related Models For Sale

Used Chevrolet Colorado
273 Great Deals out of 40,691 listings starting at $1,999
Used Ford Ranger
120 Great Deals out of 4,408 listings starting at $1,295
Used Chevrolet Silverado 1500
1,765 Great Deals out of 155,363 listings starting at $1,000
Used Toyota Tacoma
432 Great Deals out of 48,711 listings starting at $2,994
Used GMC Sonoma
280 listings starting at $2,150
Used Ford F-150
2,415 Great Deals out of 207,421 listings starting at $1,300
Used Dodge Dakota
84 Great Deals out of 3,087 listings starting at $1,495
Used Nissan Frontier
288 Great Deals out of 23,218 listings starting at $1,295
Used Chevrolet Blazer
705 listings starting at $900
Used GMC Sierra 1500
749 Great Deals out of 61,489 listings starting at $1,395
Used GMC Canyon
94 Great Deals out of 15,265 listings starting at $2,750
Used Dodge Ram 1500
323 Great Deals out of 9,370 listings starting at $1,995
Used Chevrolet Camaro
240 Great Deals out of 27,311 listings starting at $2,077
Used Ford Mustang
256 Great Deals out of 38,498 listings starting at $1,350

Used Cars For Sale

2004 Chevrolet S-10 For Sale
29 listings starting at $3,995
2003 Chevrolet S-10 For Sale
3 Great Deals out of 205 listings starting at $2,650
2002 Chevrolet S-10 For Sale
149 listings starting at $3,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.