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2017 Chrysler 300 Limited Battery Draining Overnight

0

Mike T. · rep 0 · May 25, 4:24 AM · 1 replies · solved · Question

Vehicle: 2017 Chrysler 300 Limited

My 2017 Chrysler 300 Limited has developed a frustrating issue where the battery drains completely overnight. I'll park it, everything seems fine, but by morning, it's dead. I've had to jump-start it several times this week alone. I replaced the battery about a year ago, so it's relatively new.

I've checked to make sure all lights are off and doors are closed, but something is clearly drawing power. Could this be a parasitic draw? What should I be looking for, or is this something I need to take to a mechanic immediately? Any advice would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:24 AM

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ClearTheCode admin answer:

A parasitic draw is a very common cause of overnight battery drain. This means something is still consuming power even when the vehicle is turned off. Here's how to approach it:

  1. Confirm Battery Health: Even if it's a year old, have the battery tested at an auto parts store. A failing battery, even if relatively new, can lose charge quickly. Also, check the battery terminals for corrosion and ensure they are tight.
  2. Check Alternator: A failing alternator might not be charging the battery sufficiently while driving. Most auto parts stores can test your alternator for free while it's still in the car.
  3. Basic Checks for Obvious Draws:
    • Are any interior lights (glove box, trunk, vanity mirrors) staying on?
    • Is the aftermarket radio or any other accessory properly wired and turning off?
    • Check for phone chargers or other devices left plugged into USB or 12V outlets.
  4. Parasitic Draw Test (DIY if comfortable):
    • You'll need a multimeter capable of reading amps.
    • Disconnect the negative battery terminal.
    • Connect the multimeter in series between the negative battery post and the negative battery cable (red lead to cable, black lead to post). Make sure the multimeter is set to read amps (usually 10A or 20A range).
    • Close all doors, wait for the car to 'go to sleep' (this can take 15-30 minutes as modules power down). A normal draw is typically under 50 milliamps (0.05 amps).
    • If the draw is high, start pulling fuses one by one until the amperage drops significantly. This will help isolate the circuit causing the draw.

Common Causes of Parasitic Draw:

  • Faulty body control module (BCM).
  • Stuck relays (e.g., for fuel pump, AC clutch).
  • Aftermarket accessories wired incorrectly.
  • Faulty Uconnect module or radio.
  • Door switch not registering 'closed' properly.

When to See a Shop: If you're uncomfortable performing a parasitic draw test yourself, or if you've identified a circuit but can't pinpoint the exact component, it's best to take your Chrysler 300 to a qualified mechanic. They have specialized tools and diagnostic equipment to quickly identify the source of the draw, especially if it's related to a complex electronic module. A dealership or independent shop specializing in electrical diagnostics would be ideal.

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