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2020 Nautilus Battery Drain Mystery - Help!

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Eric V. · rep 0 · May 22, 6:07 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Nautilus Reserve

My 2020 Lincoln Nautilus Reserve has been giving me headaches lately. Over the past few weeks, if I leave it parked for more than a day or two, the battery is completely dead. I've had to jump-start it multiple times.

I've checked the obvious things like making sure lights are off and doors are fully closed. The battery itself is only about 2 years old, so it shouldn't be failing already, but I'm starting to wonder.

Is there a common electrical issue with these models that could cause a parasitic draw? I'm not getting any warning lights on the dash before it dies. Any ideas on where to start looking?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:07 AM

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ClearTheCode admin answer: A parasitic battery drain on a modern vehicle like your 2020 Lincoln Nautilus Reserve can be tricky to diagnose, as many modules remain active for a period after the vehicle is shut off. Here's a systematic approach:

  1. Confirm the Battery's Health: Even if it's only two years old, a faulty battery can develop internal shorts. Have the battery professionally tested (load test) at an auto parts store or mechanic. A weak battery can also exacerbate parasitic draw symptoms.

  2. Perform a Parasitic Draw Test:

    • Ensure the vehicle has been off for at least 30-60 minutes to allow all modules to "go to sleep."
    • Disconnect the negative battery terminal.
    • Connect a multimeter in series between the negative battery post and the disconnected negative battery cable. Set the multimeter to measure amperage (amps).
    • The initial reading will be high, but it should drop significantly (ideally below 50mA, or 0.05 amps) after all modules power down. If it stays consistently high (e.g., above 100mA), you have a draw.

  3. Identify the Source (Fuse Pull Method):

    • While the multimeter is connected and showing a high draw, start pulling fuses one by one from the fuse box (both under the hood and inside the cabin).
    • Watch the multimeter. When the amperage drops significantly after pulling a specific fuse, you've identified the circuit where the draw is occurring.
    • Consult your owner's manual or a service manual to identify which components are on that circuit. Common culprits include infotainment modules, telematics units, power seat modules, or even a faulty alternator diode.

  4. Check for OBD Codes: Although a direct battery drain might not always trigger a code, a faulty module causing the drain might. Use an OBD-II scanner to check for any stored or pending diagnostic trouble codes (DTCs), especially in modules related to the electrical system (e.g., BCM - Body Control Module, APIM - Accessory Protocol Interface Module).

When to See a Shop: If you're uncomfortable performing these electrical tests, or if you've identified a circuit but can't pinpoint the exact component, it's best to take your Nautilus to a qualified Lincoln dealership or an independent automotive electrical specialist. They have advanced diagnostic tools and wiring diagrams to efficiently locate and repair the source of the parasitic draw. Ignoring a persistent drain can shorten battery life and potentially damage other electrical components.

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