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Charging problem on 2006

Discussion in 'PT Cruiser' started by ptcrooser, Dec 14, 2016.

  1. ptcrooser

    ptcrooser Member

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    Looking for some advice.

    My PT is not charging properly. I changed the battery (mostly because it was old anyway.) And is have had a bench test done on the alternator and the guy says it is fine.

    When idling is it cranking out 13 - 13.5 volts, but when there is a load on the system the out drop down to 10 or 11.

    Any have any advice one where to look next?

    Thanks!
     
  2. Doug D

    Doug D Virginia Gentleman

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    If you have a multi-meter (they run about $15-$20) the battery voltage at rest (engine not running) should be 12.6 volts (6 cells x 2.1 volts each). With the engine running the voltage should be over 14 volts (14.3-14.4 volts). Anything less points to the alternator not producing a sufficient charge.

    Before replacing the alternator though, I would definitely clean the battery posts and cables, and then measure the voltage again. A film can build up over time and create resistance and limit voltage.

    Perhaps Imperial or Bob Lincoln will post a reply. They are a bit more knowledgeable on this. Bob's an electrical engineer and Imperial is a former Chrysler mechanic. I just know the basics. I don't think a bench test is a sufficient test.

    Most auto parts retailers (AutoZone, Advance Auto, NAPA) will test the charging system for no charge.
     
  3. AllanC

    AllanC Active Member

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    275
    I would suspect one or more failed diodes in the alternator. AT low electrical low the system can manage but at higher load / engine rpm, it cannot produce desired electrical current and voltage.
     
    Bob Lincoln and Doug D like this.
  4. ImperialCrown

    ImperialCrown Moderator Level III Supporter

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    Welcome to Allpar. Any fault codes or battery light coming on? If your charging voltage falls below normal, there is a alternator/regulator/wiring/connection problem that has to be located and corrected.
    There was also a PCM software flash addressed in TSB # 18-007-07 for P0622/P063A fault codes:
    http://www.dixie-electric.com/tsb/TSB_852.pdf
     
  5. Bob Lincoln

    Bob Lincoln "CHECK FAULT CODES" Level 2 Supporter

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    That was my experience once. I confirmed it by measuring a fast drop in battery voltage with engine off. By morning it would barely crank and not start. Was 13.3 volts at idle when it was running.