Question about 2003 Cadillac CTS

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Battery light stays on after replacing alterantor. alternator is charging. gen. L terminal signal C receives 5 volts from PCM unpluged from alt. . pluged in the PCM turns on the 5 volts then shuts off the 5 volts to the alt. then the battery light comes on on the IPC.

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: When accelerating alternator light comes on.

Possible loose or worn alternator belt. Check the condition of the belt. If it's worn, replace it. If it's just loose, tighten it up.

Posted on Jan 24, 2009

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  • 295 Answers

SOURCE: is there a fuse/fusible link to alternator,

The wiring burning up at the altenator most likely caused the diode inside the altenator to short out. I would just replace the altenator now.

Posted on Mar 18, 2009

chrischronic
  • 235 Answers

SOURCE: 2005 mercury mariner charging probles

if the altinator is only charging 12.8 volts then its bad. it should be charging 13 to 14 volts

Posted on Mar 25, 2009

  • 255 Answers

SOURCE: 1995 cadillac eldorado battery volts low

i know you dont want to hear this, ck alternator output, if it is above 13.25 your are in business any lower replace it be sure alternator is wired correct on back

shack

Posted on Apr 14, 2009

motor1258
  • 6674 Answers

SOURCE: battery terminal gets extremely hot. just replaced alterantor and battery. battery indicator light also on.

Sounds like for one reason or another that alternator is putting out too much voltage to battery. Did mechanic check to see if new alternator was rated same or close to old one, as in amperage rating? Pulley on new alternator same size? You'll need to get it to another mechanic who knows what he's doing, obviously that guy wasn't too concerned with curing your problem. That's why I was hoping you had a voltage reading when running.

Posted on Jun 03, 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

1 Answer

I HAVE A 2003 PT CRUISER AND THE BATTRY LIGHT IS ON NEW BATTERY NEW ALT AND THEY SAY IT IS THE VOLTAGE REG


The PT cruiser uses a field signal from the PCM to regulate the voltage. If you are not getting approximately 14 volts at the battery terminals when the engine is running, either:
  1. The replacement alternator is faulty.
  2. The generator field control signal from the PCM is faulty.
  3. The Fusible Link between the alternator and the Starter Motor (which is also the same electrical point as the battery positive terminal is open.
Use the diagram below and check the alternator output at the point labeled "A11 6 BK/GY" If this is 14 volts and there is not 14 volts at the battery terminals, then the Fusible link is bad. If there is no voltage or way less than 15 volts at the alternator, then the alternator or the PCM field signal is bad. Ensure the connector from the PCM is connected properly.


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Sep 27, 2015 | 2003 Chrysler PT Cruiser

1 Answer

98 chevy malibu my alt isnt charging new alt batt test good cut out the fuselink on starter the alt wire runs thru firewall If i run a wire straight to the batt it is putting out 19v any suggestions


Did you check the fuse in the under hood fuse box ? GEN / BATT fuse 10amp . Is your check engine light on ? This is a computer controlled charging system , it should have four wires connected to the alternator . 1 - the heavier wire on the back ,this comes fro the starter - the one with fusible link , you could have checked for battery voltage with voltmeter ! The three other wires in the connector are the orange one ,this comes from the GEN / BATT fuse an should have battery voltage ! The last two come from the PCM - engine computer . The gray wire is the turn on signal from the PCM an the Red wire is the control from PCM ! Charging System Wiring Diagram MOTOR Magazine Article MOTOR Information Systems

Aug 14, 2015 | Cars & Trucks

1 Answer

I have a 2008 Ford F-150 4x4 , 5.4 litre engine and the battery light came on so I had it diagnosed and was told to replace the alternator . It caused multiple trouble codes to come on as well so I...


The signal for charging system goes from the generator to the PCM, then to the instrument panel gauge. If that signal is lost or the PCM is sending a false signal the light will come on. Unfortunately, there is no way to check that without a Ford IDS scanner through a dealer. It may have a bad wire or bad PCM. I have seen loose terminals or broken wires from wiring connector at alternator. I would definitely check there before going to a dealer though.
I am a Ford dealership service manager.

Jan 29, 2015 | Ford Cars & Trucks

1 Answer

Have an 07 f350 Ford pick up 6.0L power stroke .batterys replaced . Alternator replaced . Dash battery light still stays on no charge .soure voltage gd to alternator ,and plug . Reads gd voltage to si


I would try the regulator, there is a few tests to see if the alternator is charging, use a multi meter and check the b post on the alternator and earth and see what voltage it is producing, check all those sort of things and you will find the problem, make sure the battery terminals are very clean or they won't accept charge as well, hope this helps

Dec 28, 2014 | Ford Cars & Trucks

2 Answers

I have 2003 Saturn Ion and I have bought a new


test the battery voltage while the engine is running, (you'll have to jump it again)
if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

Oct 01, 2014 | 2003 Saturn ION

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

2 Answers

2000 vw jetta alternator won't charge


the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.

Aug 05, 2012 | Cars & Trucks

2 Answers

I have a 2001 olds. Alero, it is not charging...we have tried changing the alternator, battery, starter, alt. wires, ignition, nothing has helped.


Hi, check the 10 amp field fuse labeled GEN BATT in the box under the hood. If the fuse is good, the problem is the wiring from the PCM or the PCM itself, which controls the alternator. You can try backprobing the red wire at the alternator connector with a test light to see if the turn-on signal is coming from the PCM. Please let me know if you have questions, and thanks for using FixYa.


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Aug 03, 2011 | 2000 Oldsmobile Alero

3 Answers

2003 windstar alternator over charge I try 5 or 6 alternator diferent companie always the same problem go up to 18.80 v help me please


it should notgo over 14 1/2 volts.

Get free DTC codes scan from Autozone. I think you will get DTC code 1246 - System Voltage Malfuction.

The I (indicator) (BAT light) wire activates alternator field circuit.

The heavy B wire circuit sends current to the battery for charing and to run the car.

The S circuit helps control the amount of charge. I suspect yours is not controlling. This car has the PCM (engine computer) help control the output and turn the BAT light on when under or over charging.

SECTION 414-00: Charging System - General Information 2003 Windstar Workshop Manual
DESCRIPTION AND OPERATION Charging System This vehicle is equipped with a powertrain control module (PCM)-controlled "smart charge" charging system. The PCM-controlled charging system is a system whereby the PCM determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. The PCM-controlled charging system is unique in that it has two uni-directional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated. The GEN COM line communicates the desired setpoint from the PCM to the voltage regulator and the GEN MON line communicates the alternator load condition to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
-------------------------------------
  • Charging system malfunction (high or low system voltage)
  • possible causes:
    • A circuit 35 (OG/LB).
    • A circuit fuse link.
    • B+ circuit 36 (YE/WH).
    • B+ circuit fuse links.
    • Generator.
    • PCM
    • GEN-COM circuit 586 (RD/PK).
    • GEN-MON circuit 585 (VT).
    -----------------------------------------------------------------------------------
    Generator The generator (10300) on this vehicle is monitored and controlled by the powertrain control module (PCM). The PCM monitors the voltage regulator and sends a duty cycle command back to the voltage regulator to regulate the amount of field current supplied to the generator. The generator has an internal voltage regulator. The generator and voltage regulator are installed as an assembly.
    --------------------------------------------------
    I'll send wiring diagram tomorrow.

    please rate

    May 20, 2011 | 2003 Ford Windstar

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