Question about 2002 Cadillac Seville

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My 2002 cadillac Seville STS charges at 15.2 volts most of the time and the correct 14.3 volts some times. I looked for the red device under the back seat but it does not exist, Can you suggest what to replace to fix this problem before it leaves me on the side of the road. Thanks Steve

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  • steveloughra Sep 30, 2010

    I will try changing this. ($1000) but I have heard that this does not fix the problem.I hope it does.

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  • Cadillac Master
  • 6,826 Answers

Sounds like the voltage regulator in the alternator may be bad.

The alternator should be changed in this case.

Overcharging the battery can harm it and that may need to be replaced if the acid leaked out.

Good luck on this repair.

Posted on Sep 30, 2010

  • 1 more comment 
  • Duane Wong
    Duane Wong Sep 30, 2010

    Maybe try a salvage yard for the part.

  • Duane Wong
    Duane Wong Sep 30, 2010

    NOTE: Under and overcharging are typically caused by a defective alternator, or its related parts (regulator). The voltage regulator is internal to the alternator assembly in many vehicles. Faulty wiring and other problems can also cause the charging system to malfunction. Further testing, which is not covered by this book, will reveal the exact component failure. Many automotive parts stores have alternator bench testers available for use by customers. An alternator bench test is the most definitive way to determine the condition of your alternator

  • Duane Wong
    Duane Wong Sep 30, 2010

    Removal and Installation


    To Remove:

    NOTE: The OEM Denso SC1 (KG9) alternator is serviced as a complete unit only.


    1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section.
    2. Remove or disconnect the following:

      • Negative battery cable
      • Drive belt
      • Engine cooling fans





        Wiring harness at alternator




      • Wiring harness connector

    3. Reposition the protective boot from the alternator output BAT terminal (for access).

      • Alternator output BAT terminal nut
      • Positive lead






      Alternator mounting




    4. Loosen the lower alternator bolt (C).

      • Alternator bolts (A,B) from the alternator
      • Alternator from the vehicle

    To Install:


    1. Position the alternator to the A/C compressor and engine.
    2. Install or connect the following:

      • Alternator mounting bolts

        1. Torque to 37 ft. lbs. (50 Nm)

      • Wiring harness connector to the alternator
      • Battery positive lead
      • Alternator output BAT terminal nut

        1. Torque to 111 inch. lbs. (12.5 Nm)

    3. Press the protective boot on the alternator output BAT terminal

      • Engine cooling fans
      • Drive belt
      • Negative battery cable

    4. Test drive the vehicle.


    Previous Next

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