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2015 200S Low voltage

Discussion in 'Repairs, Maintenance, Help' started by Chrysfan, Dec 15, 2017.

  1. Chrysfan

    Chrysfan Active Member

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    So a few weeks ago I had three hard starts and my car died. My battery was only 18 months old. Jumped the car, took it to the dealership and they said the battery tested fine. That lasted three days. The car died again after three hard starts. Jumped it and dropped it off at the dealer. They tested the battery again and said it was a bad cell, replaced the battery. Started it the first time at the dealership and it was a very rough start. It lost power when driving back to work. This time had it towed to the dealership since I didn't feel safe to drive it. They did an update that included loss of power and it seems to be starting fine. It's been two weeks and the battery says its running 13.2-13.6 volts and seems to be decreasing. I'm at a loss of what to do. Any ideas are appreciated.
     
  2. Planefixer

    Planefixer Member

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    Is your alternator charging?
     
  3. Chrysfan

    Chrysfan Active Member

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    Good question. The dealership said there was not a problem with the alternator two weeks ago. It is currently holding at 13.2 v. The dealership said to bring it in if it dips below 13.
     
  4. valiant67

    valiant67 Rich Corinthian Leather
    Level III Supporter

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    There is a recall for alternators, but as near as I can tell the 200 is not on the list of vehicles being recalled.
     
  5. David Eidell

    David Eidell Well-Known Member

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    ECU voltage regulation on a MoPar can be compared to the temperament of a Hungarian movie actress. Voltage rhythmically surges and subsides a few tenths of a volt. Thermistor temperature compensation of voltage is sloppy.
    On and on I can criticize. Yet the battery not only stays charged, they last a long time. I may moan but the only valid criticism I can provide is that it makes monitoring the battery difficult.
    There is considerable voltage droop when accessories are switched on. The majority of the droop is in the ignition circuit, and not in the charging/battery circuit. I have relegated the readings of my dash gauge to the same level of integrity as The National Inquirer vs The National Geographic Society. If the engine barfs the alternator drive belt, the gauge will sag to the same reading as I get when I switch the ignition on but not start the engine. What I can say about the ECU voltage regulator circuit is that it is rugged. The integrity of the harness from the alternator field, less so.
     
    tomit likes this.

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