Question about 2000 Audi A4

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Battery indicator after new alternator Audi A4

2000 Audi A4 1.8
Battery indicator came on and voltage dropped to 10V. AAA tech used portabel diagnostic indicator and determined alternator was bad. Car did run with a jump although at 10V. Towed to AAA certified mechanic. They replaced alternator. Voltage back at 14V for a few miles then battery indicator came back on. Voltage now at 12V. Do I need a battery? Is there a voltage regulator in the Audi? Could it be the alternator was not bad after all? I just want some knowledge before I talk to the mechanic about it.

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  • pdu111 Jul 02, 2009

    I believe the alternator was a high quality remanufactured unit. Cost me about $490 for the part. I just talked to an Audi service person who said they dont see many alternators or voltage regualators go bad but batteries are usually the culprit.

  • pdu111 Jul 02, 2009

    Its a Bosch alternator $490. The battery has a date of 2004. How many years should the battery last?

  • yadayada
    yadayada May 11, 2010

    anything is possible, was a new alt used or a rebuilt? have the system retested

  • Gervacio Magalong
    Gervacio Magalong Aug 16, 2016

    I am having this same problem. Old alternator died and was reading 8v at the battery.

    Installed new one from advanced auto, read 14v after install. After about 25 miles it now reads 12v when running and not charging.

    How did you fix your issue?

  • Gervacio Magalong
    Gervacio Magalong Aug 16, 2016

    I am having the same problem. Old alternator when running tested at 8v so I replaced it with one from advanced auto. Measured 14v and charging after install. 25 miles later it now reads 12v and is not charging the battery. I have replaced both grounds (one up top and the other from engine block to body) still reading 12v

    I am desperate. How did you fix yours, I dont want to shell out $600 for one from Audi only ot be in the same spot!

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Check the little wire that attaches to the back of the alternator it could be broke or hooked up wrong the wire should be connected to the passenger side prong

Posted on Nov 22, 2016

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Take it to an Audi dealer. Could have been a bad alternator, and another bad alternator if they didn't use Audi part. Don't use cheap rebuilt Chinease stuff on your Audi.

Posted on Jul 02, 2009

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My battery light came on while i was driving than a few minutes later everything shut off. The battery was replaced in january and alternator was replaced in october.. what could be the problem?


For the alternator to work B+ voltage must be applied to the heavier gage wire on the back of the alternator ,plus the alternator is computer controlled , by the PCM !
Charging System Indicators
BATTERY The IPC illuminates the battery indicator when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


?€¢
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


?€¢
The ignition is on, with the engine off.
BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


Your best is to have a qualified repair shop check it out ! Could have DTC'S - diagnostic trouble codes stored !
DTC P0562
The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other drive ability concerns.
DTC P0621
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
DTC P0622
Checking for codes an voltage drop testing the connections an using a scan tool to check data parameters is the only way to solve your problem . Which means taking to a qualified repair shop !

Jul 26, 2016 | 2002 GMC Envoy

2 Answers

Voltage drops when setting still has new battery and alternator


Check grounds. Look at your cables. Could be corrosion.

Oct 30, 2015 | Cars & Trucks

1 Answer

What is causing the battery to drain?


Running the car will drain the battery it if it's not charging ! An if your charging light is on it isn't charging ! Did you check power an grounds on the alternator ? There is a single heavier wire on the back of the alternator, this should have battery voltage ! You may want to take this to a ASE certified repair shop !
Functionality
With the ignition switch in the RUN position, voltage is applied through the warning indicator I circuit 904 (LG/RD) to the voltage regulator. This turns the regulator on, allowing current to flow from battery sense A circuit 35 (OG/LB) to the generator field coil. When the engine is started, the generator begins to generate alternating current (AC) which is internally converted to direct current (DC). This current is then supplied to the vehicle's electrical system through the output (B+) terminal of the generator.
Once the generator begins generating current, a voltage signal is taken from the generator stator and fed back to the regulator S circuit 4 (WH/BK). This voltage feedback signal (typically half the battery voltage) is used to turn off the warning indicator.
With the system functioning normally, the generator output current is determined by the voltage of the A circuit 35 (OG/LB). The A circuit 35 (OG/LB) voltage is compared to a set voltage internal to the regulator, and the regulator controls the generator field current to maintain the correct generator output.
The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures. This allows for better battery recharge in the winter and reduces the chance of overcharging in the summer.
Battery Positive Output (B+) Circuit 38 (BK/OG)
The generator output is supplied through the battery positive output (B+) terminal on the back of the generator to the battery and electrical system.
I Circuit 904 (LG/RD)
The I (ignition) circuit 904 (LG/RD) is used to turn on the voltage regulator. This circuit is powered up with the ignition switch in the RUN position. This circuit is also used to turn the charging system warning indicator on if there is a fault in the charging system operation.
A Circuit 35 (OG/LB)
The A (battery sense) circuit 35 (OG/LB) is used to sense battery voltage. This voltage is used by the regulator to determine generator output. This circuit is used to supply current to the generator field (rotor). The amount of current supplied to the rotor will determine generator output.
S Circuit 4 (WH/BK)
The S (stator) circuit 4 (WH/BK) is used to feed back a voltage signal from the generator to the regulator. This voltage is used by the regulator to turn off the charging system warning indicator. The S circuit is fed back externally on external mounted regulator generators.
Visual Inspection Chart Mechanical Electrical
  • Battery case, posts, hold-down clamp, cables and connections
  • Generator drive (serpentine) belt for condition and tension to make sure there is no slip between the belt and the pulley. For additional information, refer to Section 303-05 .
  • Battery charge
  • Generator pulley
  • Battery junction box (BJB)Mega Fuse
  • Battery junction box fuse:
    • 11 (20A)
  • Central junction box (CJB) fuse:
    • 30 (30A)
  • Circuitry
  • Charging system warning indicator
  • Cables
  1. Check the operation of the charging system warning indicator lamp (instrument cluster). Normal operation is as follows:
    • With the ignition switch OFF, the charging system warning indicator should be OFF.
    • With the ignition switch in RUN and the engine off, the charging system warning indicator light should be on.
    • With the engine running, the charging system warning indicator light should be off.
  1. Verify the battery condition. Refer to Section 414-01 .
Normal Charging System Voltages and Charging System Warning Indicator Operation Ignition Switch Position A Circuit 35 (OG/LB) S Circuit 4 (WH/BK) I Circuit 904 (LG/RD) Generator B+ Circuit 38 (BK/OG) Battery Engine to Battery Ground Charging System Warning Indicator Operation OFF 12 volts 0 volts 0 volts 12 volts 12 volts 0 volts Off RUN-engine off 12 volts 0 volts 1-3 volts 12 volts 12 volts 0 volts Illuminated RUN-engine running 13-
15 volts 1/2 battery voltage 13-
15 volts 13-
15 volts 13-
15 volts 0 volts Off
  1. If the customer concern is verified after the initial inspection, refer to the Symptom Chart to determine which tests to carry out.
    • The charging system warning indicator is on with the engine running (the system voltage does not increase)
    • Circuitry.
    • Voltage regulator.
    • Generator.
    • GO to Pinpoint Test B .
    Your whole problem is the alternator is not charging , a couple tests with a volt meter would tell you !

Aug 16, 2015 | 2001 Ford Expedition

1 Answer

I have a 2000jeep Cherokee limited. When I crank


which engine, we can not guess engines here. not ever. (rare)
this is called a XJ car.
2.5l or 4.0 liter or the Diesel????

ok electrics 101.
all electronics and electrics have a rule
of power is low, things go nuts.
its like not eating and blood sugur drops then you drop.
same deal;
each part has a rule for this but im not going there, (can but wont)
the starter goes dead at 8v
if the battery is weak many electronics goes nuts at below 10v.
varies by year and make of car and all options on the car.
for windows, IM NOT GOING THERE> way too complex of topic that.
(mix of parts)
so when the door goes nuts, what is the battery voltage
a tech, uses a voltmeter,
walmart sells one for $10 in auto and in the elect. department.

is the battery too low, cranking?
here are the 3 rules for the battery after cleaning posts.

1: charged battery rested , is 12.6v. not in siberia , summer temps.
2: running engine battery voltage is 13.3 to 15v, if not the battery drains.

3: cranking, most books show 11v. but if not below 10v your ok
most the time. but who knows, that? nobody on earth.

why not use booster jumper cables to a running other car AAA STYLE?
if the noise goes away, then may be ,
the battery is low
battery discharge
or battery is weak (bad)
or you have parasitic drains.
or the charge system is bad.

KEEP IN MIND i cant hear it. so... all my answers will sux.

Sep 27, 2014 | 2000 Jeep Cherokee

1 Answer

2001 Cadillac DeVille RPMs revving dying


battery not charging , means the charging system is not working , Doesn't mean the battery is bad . The charging system on your vehicle is computer controlled , If the BCM doesn't see the correct voltage , it will raise the idle RPM to over come any load on the system . Probably has DTC'S - diagnostic trouble codes stored in the BCM or PCM , These codes do not always turn on the money light ( check engine ) . Your best bet , take it to the Cadillac dealer , auto zone or any of those has no clue about this . Oh also it will shut down systems . http://www.esghotwire.com/0213_Pit.pdf
Battery symbo - Charging System Indicators

BATTERY NOT CHARGING - 7Charging System Indicators

BATTERY NOT CHARGING - 7
The IPC illuminates the BATTERY NOT CHARGING - 7 indicator in the DIC when the PCM detects a malfunction with the generator output. The IPC receives a class 2 message from the PCM requesting illumination.

I work for Cadillac , have for over thirty year's . Have seen people mess this stuff up big time . So do yourself an take to one of my fellow tech's.

Electrical Load Management
The power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high discharge condition. This is accomplished by using a high accuracy battery voltage reading as an indicator of battery discharge rate. The following six levels of load management will execute in the load management control algorithm when there is a high discharge condition:
The first action requests a vehicle idle speed increase to the powertrain control module (PCM) in order to raise alternator output.
The second action requests a greater vehicle idle speed increase to the PCM in order to raise alternator output.
The third action begins to shed vehicle loads in an attempt to remedy the heavy discharge condition.
The fourth action requests another vehicle idle speed increase to the PCM in order to raise further the alternator output.
The fifth action begins to shed further vehicle loads in an attempt to remedy the heavy discharge condition.
If the above five corrective actions fail, the sixth action of power management further sheds loads in a final attempt to remedy the high discharge condition.
Loads subject to reduction include the following:
• The A/C clutch
• The heated mirrors
• The heated seats
• The rear defog
• The HVAC blowers
The power mode master (PMM) calculates the battery temperature, voltage and charging rate at all times while the engine is running. The PMM calculates the battery temperature by factoring in:

Mar 18, 2017 | Cadillac Cars & Trucks

1 Answer

1989 f350 7.3 replaced voltage regulator and alternator same time. still not charging


you should have 12.5 volts with engine off at battery and 14.4v with engine running and charging system working. Is alternator light on? please rate, thx.

There are different versions and 1989 is too old to get on line. here is 1993, so take with caution. Also check the fusible link.

Battery Positive Voltage (B+) Output
The generator (alternator) output is supplied through the Battery Positive Voltage (B+) output connection to the battery and electrical system. I Circuit
The I circuit, or ignition circuit is used to turn on the voltage regulator. This circuit is powered up with the ignition key in the RUN position. This circuit is also used to turn the indicator on if there is a fault in the charging system operation or associated wiring circuits A Circuit
The A circuit, or battery sense circuit, is used to sense the battery voltage. This voltage is used by the regulator to determine the output. This circuit is also used to supply power to the generator (alternator) field coil. This circuit is connected back to the load distribution point and is a protected circuit. S Circuit
The S circuit, or stator circuit, is used to feedback a voltage signal from the generator (alternator) to the regulator. This voltage, typically 1/2 battery voltage, is used by the regulator to turn off the indicator.


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Oct 12, 2011 | 1989 Ford F 350

1 Answer

My 86 Audi 5000 CS Turbo has quit running while driving but at stop signs or stop lights with no indication of anything wrong. When I try to start it again the battery is dead. I've bought batteries...


IF ALTERNATOR AND BATTERY BEEN REPLACED.REPLACE THE BATTERY CABLES AND CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR POWER BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE.

Sep 04, 2011 | 1986 Audi 5000 CS

1 Answer

Sometimes my battery light comes on and then goes off after a minute or so, sometimes stays on for a long time. I managed to get home without it coming on once which was about a 25 minute dirve, but I...


Here is a simple test to determine the condition of the battery and alternator.
First, make sure the battery posts are clean and the cables are in good shape.

Using a volt meter, check standing battery volts at the posts, with nothing in the car on.
Lets say 12 to 13 volts is good. If standing battery voltage is way less than 12 volts the battery is probably bad.
Now start the engine, make sure no electrical items are on and check the battery voltage at the posts again. This reading should be 1 to 1.5 volts higher than the first reading.
If there is little or no change, or less volts then the alternator is bad.

Just for fun, while the engine is running, turn on the things you normally have on when driving and check the voltage one more time. If volts continue to drop, then without a doubt its the alternator.
Hope this helps.

Aug 04, 2011 | 2000 Dodge Neon

1 Answer

My 94 lexus es 300 the engine light stays on n sometimes my battery light comes on wat does tat mean


Hi, the engine light is indicating that the computer has detected a fault. You will have to extract the trouble code to determine the fault. Go here for instructions on diagnostics: http://www.clublexus.com/forums/es300-and-es330/324049-obd1-check-engine-light-codes.html
Please get back to me with the results/trouble code for assistance in resolving the fault.

The battery light may be indicating a weak alternator. Check the voltage at the battery with the engine idling. If the voltage is less than 14 volts, replace the alternator.

Mar 16, 2011 | Lexus ES Cars & Trucks

1 Answer

1999 f250 will not charge battery


It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

Aug 10, 2008 | 2000 Ford F250 Super Duty Crew Cabs

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