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2000 SEDAN DEVILLE CADILLAC ( BATTERY CHARGING VOLTAGE )

39chev39chev Posts: 1
edited March 9 in Cadillac
I AM TRYING TO FIND OUT THE CORRECT VOLTAGE I SHOULD MEASURE AT THE BATTERY WHILE THE ENGINE IS RUNNING AT IDLE?? MY WIFE'S CAR WOULD NOT START BUT DID AFTER THE BATTERY WAS CHARGED FOR 45 MINUTES. THE BATTERY IS ABOUT A MONTH OLD. AFTER CHARGING THE BATTERY I DROVE THE CAR TO WORK AND THEN BACK AFTER WORK.( 18 MILES EACH WAY ) THE INFORMATION PANEL SAYS 11.9 VOLTS BATTERY OK. AND THE VOLTAGE I MEASURED AT THE BATTERY IS 12.04VDC. THE BATTERY CONNECTORS ARE TIGHT AND NO CORRISION. I ALSO MEASURED THE VOLTAGE WITH THE HEADLIGHTS ON AND IT WAS THE SAME. NO LIGHTS WERE LEFT ON OVERNIGHT. I KNOW ON MOST CARS THAT THE CHARGING VOLTAGE IS APPROX. 13.5 TO 14.5VOLTS WHILE THE MOTOR IS RUNNING. ANY INFO. WILL BE APPRECIATED. THANKS

Comments

  • Hope it helps, it pretty basic info, but normally it should be between 12.5-14 volts while engine is running.

    What does the Driver Information Center say the voltage is ?

    Check the connections in the engine bay where the jump start terminals are at.

    There is also an informational Bulliten #A000336, but the dealership has to call in to get the info.

    P.S. We stopped making the Sedan De Ville a LONG time ago, now they are all sedans and known just as DeVille.

    Charging System Circuit Description

    The generator provides DC voltage to operate the vehicle's electrical system and to charge the battery. A magnetic field is created when current flows through the rotor. The rotor is belt driven by the engine,
    creating an AC voltage as this field rotates within the stator windings. The AC voltage is converted to DC by the rectifier bridge and is then supplied to the electrical system at the generator battery terminal.

    When the engine is running, the generator turn-on signal is sent to the generator from the PCM, turning on the regulator. The generator's voltage regulator controls current flow to the rotor, thereby
    controlling the output voltage. The rotor current is proportional to the electrical pulse width modulated voltage supplied by the regulator. When the engine is started, the regulator senses generator rotation by
    detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for
    proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. The PCM monitors the duty cycle of the regulator
    on the generator F terminal. The generator S terminal is connected to B+ voltage at the rear fuse block. The voltage is used by the regulator as a reference for system voltage control. The dash integration
    module (DIM) has a designated circuit for monitoring battery voltage connected to the S terminal circuit of the generator at the rear fuse block and to ground of the battery.

    The PCM monitors F terminal and the L terminal, if a problem occurs the PCM will set DTC P0621 or DTC P0622 and sends a class 2 message to the instrument cluster requesting illumination of the
    battery charge indicator.

    The dash integration module (DIM) monitors the battery voltage. The DIM sends system voltage status to the instrument cluster. If the instrument cluster detects a system voltage high or low condition, the
    instrument cluster illuminates the battery charge indicator and displays one of the following messages on the driver information center (DIC):

    With voltage less than 10.5 volts, the DIC displays BATTERY VOLTAGE LOW.
    With voltage greater than 16.2 volts, the DIC displays BATTERY VOLTAGE HIGH

    If the instrument cluster detects a system voltage high or low condition and the engine speed is greater than 400 rpm, the instrument cluster will set the following DTCs:

    With voltage less than 10.5 volts, DTC B1513 will set.
    With voltage greater than 16.2 volts, DTC B1514 will set.
  • tateostateos Posts: 36
    Last posting was 11/9/01.

    Thanks to anyone who can explain.

    Richard Moore
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 45,244
    I think a software bug archived it permanently. You can start another discussion on this car if you want, in the Coupes/convertibles Board.

    Mr. Shiftright
    Host

    MODERATOR --Need help with anything? Click on my name!

This discussion has been closed.