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[Solved] Ford Mondeo Mk3 TDDi 2001: Charging Voltage Fluctuations with Different Load Levels

Piotrek_71 13116 9
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  • #1 17067749
    Piotrek_71
    Level 14  
    Posts: 230
    Rate: 21
    Board Language: polish
    Hello,
    I have a problem with charging from the alternator. After starting the engine, the charging voltage (measured with a multimeter with TrueRMS on the battery) without receivers is 14.7V. After switching on the dipped beam, it drops to 14.2V, after switching on the maximum number of receivers (both heated windows, heated seats, all possible lights) drops to 12.4V.
    1. Is the high charging voltage without receivers connected due to a damaged voltage regulator, or does the PCM that controls the charging see a weak battery and wants to charge it quickly?
    2. Is the charging voltage too low at the maximum load acceptable?

    The battery is new, installed in November 2016, alternator regenerated in March 2017. (bridge rectifier burnt).
    Patient Mondeo Mk3 TDDi 115KM 2001 - thanks for the help
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  • #2 17067798
    andrzej20001
    Level 43  
    Posts: 17692
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    Ford has quite high voltage. Under load but at slightly elevated speed should also be above 14V
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  • #3 17067825
    sanfran
    Network and Internet specialist  
    Posts: 9787
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    In Scenic 2, my charging sometimes reaches 15V. And the battery did not boil, lasted 9 years (but in a climate without cold winters).
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  • #4 17067850
    madamsz1
    Level 42  
    Posts: 5795
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    There's a smart battery charging system in the Ford and voltage maintenance in the installation - you know that :) . Voltage 14.7 is not a problem yet because the computer can control so much - even 15V, that's why Silver-Calcium batteries are recommended for Ford. Only voltage above 17 volts can be dangerous for electronics. However, it should not fall so when switching on receivers below 13.2 V may indicate problems, however, with the alternator In Ford it is sometimes difficult to regenerate the alto and you need to use the original elements because the replacement likes to fall after a few months :( . How can you put it on a different battery for a moment or your accident did not do a number and if nothing changes I would bet on the alternator. It happens that the computer breaks down and controls the alto badly - not often :)
  • #5 17073473
    Piotrek_71
    Level 14  
    Posts: 230
    Rate: 21
    Board Language: polish
    andrzej20001 wrote:
    Ford has quite high voltage. Under load but at slightly elevated speed should also be above 14V


    I checked one more thing - at idle at max. 12.4V load, after adding gas (even slightly) it increases to about 14V.
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  • #6 17073520
    sanfran
    Network and Internet specialist  
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    Properly. The alternator at idle will not give more than 15A, so the difference is carried away from the battery.
  • #7 17073632
    andrzej20001
    Level 43  
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    Da sle but a smaller pulley is needed ?
  • #8 17074137
    Perech
    Level 15  
    Posts: 218
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    I think that there is nothing to cling to this tension. Mondeo does
  • #9 17074143
    Piotrek_71
    Level 14  
    Posts: 230
    Rate: 21
    Board Language: polish
    Perech wrote:
    I think that there is nothing to cling to this tension. Mondeo does


    If that's his charm, it's okay :)

    I checked the charging after heating the external temperature sensor - for 17 * C it is charging 14.45V, so the high charging was probably due to the temperature correction.
  • #10 17115822
    Piotrek_71
    Level 14  
    Posts: 230
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    Board Language: polish
    The regulator operation was correct, the higher charging voltage was caused by computer temperature corrections.
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Topic summary

✨ The discussion revolves around charging voltage fluctuations in a 2001 Ford Mondeo Mk3 TDDi, particularly after starting the engine and under various electrical loads. Initially, the charging voltage is measured at 14.7V without any load, dropping to 14.2V with dipped beams and further to 12.4V under maximum load (multiple receivers activated). Participants suggest that the high voltage without load may be due to the PCM's response to a weak battery or a faulty voltage regulator. Concerns are raised about the low voltage under load, indicating potential issues with the alternator, especially since the alternator was regenerated recently. The discussion also highlights that the alternator's output can increase with engine RPM, and temperature corrections by the vehicle's computer may affect charging voltage. Ultimately, it is suggested that the regulator is functioning correctly, and the observed high voltage is likely due to temperature adjustments.
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