Question about 2003 Chevrolet Tahoe

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Battery light is on

Replaced battery and tested alt. alt is charging per meter. and light is still on.

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  • 6 Answers

Check battery cables, conections to starter and batt.

Posted on Jan 09, 2013

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Posted on Jan 02, 2017

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SOURCE: Service Charging System

DONT START THE CAR///IGNITION ON//PRESS THE GAS PEDAL DOWN 3 TIMES SLOWLY//THEN START THE CAR. THAT RESETS THE COMPUTER AND THE CHARGING SYSTEM WARNING LIGHT.

Posted on Dec 22, 2008

Just_Bobz
  • 448 Answers

SOURCE: 99 suburban electrical

Take alternator off and have it load tested. Sounds like it's leaking.

Posted on Jan 07, 2009

  • 1118 Answers

SOURCE: volt meter not accurate

I got a 95 1500 that does the same thing, and i did the same thing you did, now i don't worry about it because i know its charging.

Posted on May 06, 2009

  • 1 Answer

SOURCE: changed alt twice in two week period

Check for Blown Fuses?

Posted on Sep 28, 2009

mash_jumbie
  • 138 Answers

SOURCE: charge system problem altenator tests good new

The alternator has a lead wire to the battery. This wire may need replacing . You can replace it with Zero Gauge wire.

Posted on Feb 27, 2010

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2006 Cadillac CTS help My car was tested @auto zone for the batery n alternator n both passed Good voltage Everytime I go to crank my car it does not crank I have 2 jump it of even if it's for 15 mins


Luis: That makes no sense. But here is what others are saying: " How possible is it for a bad alternator to be tested good? I already had people telling me to replace it.

I got both the battery and alt tested. Both passed.

Reinstalled on the car and it ran good surprisingly after the battery was charged @ the autostore > till after about 10 minutes, then the battery meter dropped back down.

Soon as i turned on the lights/ac the battery meter dripped down real low. SOon as i turned them off the meter jumped back up.


Soon as i revved the engine the headlight would brighten then dim back down after the rev was over.

I can jump the car, but it will turn off by itself if you leave it idling to long then it needs another jump.
Driving it doesn't charge the battery up.. its actually drops the battery meter down more and more and more till its dead.

-Car doesn't drain the battery while its off.. so its nothing left on.


>> Now people are telling me there alternator was tested good, but the problems went away after buying a new alt.
"
Some people say there could be a loose belt not turning the alternator fast enough to supply power to lights/ac and charge battery. Or bad wires". or possibly a bad voltage regulator.

May 28, 2015 | 2006 Cadillac CTS

1 Answer

Battery light on, got new alt., starter tries to engage, but doesnt


Did you have the charging system diagnosed or did you just guess at it being the alternator . The charging system is computer controlled . The starter isn't working because low power , battery dead . Is there B+ voltage at the wire on the back of the alternator .B+ voltage at pin 3 at the connector pluged into the alternator .
Charge the battery use a volt meter an test for B+ voltage at the places i mention . No check engine light ? DTC'S - diagnostic trouble codes stored .
Ford Smart Charge System Alternator Not Charging
Ford PCM controlled alternator testing

Aug 26, 2017 | 2004 Ford Focus

1 Answer

02 Camry charging circuity


great questions...!!!
no it cant, mine can.
most dmm do 20 amps
most cars do 100 to 500 amps. cranked.
the alt can do 50, some more.
yes, its all DC, and the best tool is a DC amp clamp meter for $50
the alt is AC inside, and DC outside, thus the name.
why jnot say context what are you doing.
i need to know your plans.
dead battery ever 5 hours.
car wont start
battery explodes.
wires melt.
what?

testing the ALT on car , takes some skills
alts. can in fact shut down even when 100% OK (it's loansome)

most folks never read the spec on the VR.
its can be very complex this.

cases in point.
open ground or big wire.
battery going open inside. (cracks in battery or a cell dries up)
over volage (over 16v)
battery shorts. or cables shorts.
cable opens or ground opens/
some newer cars the ECU is the VR. ! !!!!
older cars the charge lamp out , nets you no, start up exciton field current (born dead ALT)

to do this we must know what alt we have.
the FSM covers that as does ALLDATA.com

so here are the 1st test.
12.6v at battery means charged (resetted and not freezing)
13.3- 15v running means the ALT is working
i stall engine
and leave head lights on for 2 mins. or so.. battery was discharged.
so i start up with my amp clamp (DC) clamped on to the
ALT big signal wire, it shows me 40amps.
good.
if not bad.
as i watch it ,it can drift to zero (or to 5amps ignition power)
note polarity , - is drain + is charging.
depends on clamp orientation, that is why i use discharge test first.
+40amps?

need more ask.

Dec 27, 2013 | Toyota Camry Cars & Trucks

2 Answers

My 1992 isuzu rodeo 3.1 2wd m/t has my batt. light coming on and off,when the dash light comes on my lights will


I would have everything tested first. Thats usually free at most auto part stores. It does sound like your alternator is starting to fail or possibly your battery.

Feb 02, 2012 | 1992 Isuzu Rodeo

1 Answer

2002 kia Rio Altenator not chargeing ( alt light not showing discharge ) Changed alt, Check out put with volt meter still putting out only 12.2 should be 13.8 Alt checked out OK on bench...


Hi, the actual output voltage produced by the alternator will vary depending on temperature and load, but will typically be about 1-1/2 to 2 volts higher than battery voltage. At idle, most charging systems will produce 13.8 to 15.3 volts with no lights or accessories on. This can be measured by connecting the positive (+) and negative (-) test leads of a voltmeter to the battery posts while the engine is running.

Possible cause of the alternator not charging includes Slipping or broken alternator belt, Open diode, Open circuit in stator windings, Open charging circuit, Open field circuit, Worn brushes or slip ring and Defective voltage regulator..

Feb 27, 2011 | Kia Rio Cars & Trucks

1 Answer

My alternator went out, or so I thought. I replaced it and the system still won't charge. I just replaced the battery and I know it is good. What could the problem be?


battery cables corrosion or lose. Also could be lose nut on alternator where large wire is. Clean and tighten all wire ends + - and alt. that don't work get an dc multi meter and check voltage on alt at nut when running should be like 13 to 14.5 volts black to batt ground and red to alt on multi meter. if it's not 13-15 your alt. is bad. Get your batt load tested free at autozone.

Nov 27, 2009 | 1999 Ford Expedition

1 Answer

Alternator test said good, put on car & not charging ,battery test good amp meter decrease`s


Remove and clean battery cables , replace bolts. Check for power going to the alt. it will not charge unless is has power in the connector wire. When alt is tested get them to tell you how many amps it is putting out, not volts. 12 volts will not charge a battery unless you have the correct amount of amps. I had a napa alt and had this trouble twice. The guy said it was good it had over 12 volts output, but it would not charge battery. I fixed mine with a better quality alt. from another store.

Jul 18, 2009 | 1991 Buick Park Avenue

1 Answer

When I turn the ignition on the battery light comes on and the voltage gauge drops between 9 & 14. Then it slowly goes up to around 14. I replaced the battery. Alternator??


take volt meter check voltage on batt.while truck is idling,voltage should be between 13.5-14.5v,turn headlights on it should stay in that range if it goes below,check for bad wire connection at alt.,if conn. are ok,theres a good chance alt. not charging properly!before doing test make sure batt.is full charge!

Apr 19, 2009 | 2001 Chevrolet Silverado 1500

2 Answers

Battery light on


It is possible that the extra demand placed upon the charging system finally blew the alternator.
You need to have the charging system checked,,or check the output yourself with a volt meter (should be around 14-15 volts) test must be done with the car running.
If the voltage reads up to 14 or 15 volts then it would indicated a short in the dash control circuit.

Jan 30, 2009 | 1990 Pontiac Bonneville

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