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

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?

12 Answers

83,395

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

2 out of 2 people think this is helpful.

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

83,395

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.

Best Answer

Thanks for help.

11,855

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 out of 1 people think this is helpful.
10

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

1 out of 1 people think this is helpful.
83,395

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 out of 1 people think this is helpful.

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

20

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? .

2 out of 2 people think this is helpful.
83,395

Is the ECM turning on the alternator?

20

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.

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