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2013 Explorer XLT - Parasitic Battery Drain

Discussion in 'Stock 2011 - 2019 Ford Explorer Discussion' started by stuarto, January 6, 2018.

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    1. stuarto

      stuarto New Member

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      Hi All,
      I thought I would share what I'm experiencing with battery drain. I only uncovered this, this morning, and so have not managed to really get into exploration yet. This said though, I have an initial block that one of your good folk may have the answer to.

      The situation is that with the Explorer parked in the garage, locked, nothing plugged into OBDII port, nothing plugged into DC outlets, no interior/exterior lights on, the constant battery drain is 2.1A. That is HUGE! and wrong.

      So I tried to identify the source by checking every fuse in the book under the hood for voltage drop across them - nothing. I actually doubted my meter initially because I wasn't expecting this.
      After this, I removed the cable that "plugs in" to the +ve battery terminal. I don't know if it has a specific name but it's the one with a green connector that runs left>right in direction. I'm hoping to paste the image below.
      [​IMG]

      Now that I know this is the source, I don't know where it goes. Given the gauge of the cable, this must split into many other cables or fuses that I can then go check. Anyone have any ideas? Something isn't working right downstream from this connector...specifically, it's not turning off!

      Thanks!


      Screen Shot 2018-01-06 at 6.45.04 PM.png
       
      Last edited by a moderator: January 6, 2018
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    3. peterk9

      peterk9 Staff Member Moderator Elite Explorer

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      Don't forget there is always going to be some constant drain to keep memory circuits including the alarm alive although 2.1A seems a little much.

      Peter
       
    4. thefranchise713

      thefranchise713 Active Member

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      Is this key start or push button start? If the latter, how close are the keys kept to the vehicle? if the former, is the key left in the ignition at all times (it sounds silly, but have to rule it out.)

      Do you get the 'shift to park' warning?
       
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    5. stuarto

      stuarto New Member

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      Thanks for asking :)

      Key start. Nope, keys are not left in the ignition. I haven't had the shift to park warning, no. I just learned about that earlier today when googling this topic.

      I'm still googling trying to find the circuit, from the green plug. I'm hoping that I'll find that and get then get closer to isolating the problem.
       
    6. stuarto

      stuarto New Member

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      Agreed - too much. I would hope that drain is less than 1A. Memory takes next to nothing, not even mA. Alarm might take 250mA if it's a decent one...
      Figure though, at 1A, most batteries would be dead after about 100 hours or about 4 days of not being used and that's plain crazy.
       
    7. thefranchise713

      thefranchise713 Active Member

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    8. thefranchise713

      thefranchise713 Active Member

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      BTW, at rest spec for parasitic draw is at 50ma.
       
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    9. stuarto

      stuarto New Member

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      That's more like it!
      Thank you. Am reviewing diagrams per your other link which is priceless!
       
    10. stuarto

      stuarto New Member

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      Thanks to @thefranchise713 - wiring diagrams really help.

      In case anyone reads this in the future and needs help, the "Green Plug" powers the BCM & Cabin Fuse Box (Drivers side, under dash). Diagram WRFM13EXP006a is of the BCM itself. Diagrams WRFM13EXP006b and WRFM13EXP006c lists all of the fuses.

      I'll be checking each of these tomorrow.
       
    11. thefranchise713

      thefranchise713 Active Member

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      BCM & Cabin Fuse box is one unit, if it wasn't clear.

      Pleased the link helped.
       
    12. ProjectSHO89

      ProjectSHO89 New Member

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      Did you wait the required 40 minutes after touching anything so that the battery saver would time out before making your current draw measurements?
       
    13. stuarto

      stuarto New Member

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      Yup, left overnight. >8hrs.

      Something weird is happening to cause this drain. I'll pull the fuses from the cabin fuse box 1 by 1 tmrw. It would be great to narrow it down to one fuse, although unlikely.
      I have seen weird things happen with LED's and negative switching (like the internal lamps in a car) and I'm wondering if this has something to do with it - will know tmrw!
       
    14. stuarto

      stuarto New Member

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      All,
      I wanted to close this thread off with an update.
      In short I didn't get to the bottom of this to my satisfaction but...a couple of things:
      1. When measuring the current drain, I had the hood open (somewhat necessary to do this easily). I have a hood pin and so that was open.
      2. When running a couple of leads from the battery to a voltmeter, I closed the hood. Left car overnight. Battery voltage (before unlocking car) was 12.8v. This is essentially 100% charge and so the car could not have been drawing 2.1A for about 8hrs. Or, I have a REALLY good battery ;)
      3. I did conclude that, with the hood open, the draw is from the Cabin fuse box. The "green plug" goes straight to the fuse box. I didn't go through removing each fuse one by one in the end. It's a pig to get to and it's been freezing in ON.

      So, I am satisfied I don't actually have parasitic drain when the car is just parked. I just wish I had thought of the hood pin first.

      Perhaps in the spring, I'll short the hood pin and then measure current draw accurately. For now though, there's no need.
       
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