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Register your Fusion Hybrid at the official Ford authorized registry here.

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Disconnecting your 12V Battery Temporarily

battery 12v

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3 replies to this topic

#1 OFFLINE   stlouisgeorge


    Fusion Hybrid Member

  • Fusion Hybrid Member
  • 137 posts
  • Region:U.S. Mississippi
  • Location:Saint Louis
  • Current Vehicle:Ford Fusion Hybrid Platinum (Shadow Black)
  • My Hybrid's Year:2017

Posted 07 October 2017 - 12:51 PM

Disclaimer:  DO NOT TRY THIS (Go to your dealer to resolve any issue with your car involving malfunctioning equipment).


There are times when I might want to "reboot" the electronics on my Ford Fusion Hybrid (2017).  The 12V battery is in the trunk (see picture).  Under the hood are (+) and (-) "prongs", specified by Ford (in the manual) to be used to jump the car (page 229).  This is needed since you can't open the trunk of your car without the 12V battery -- which is in trunk(!).  Explain that to your old man.


What is the best way to disconnect your 12V battery?  I did it by loosening the nut labeled "A - Negative Side" on the photo.  The "washer" under the nut made an unsettling "crackle" sound (as it formed a circuit on and off a few times -- was I"frying something"?)  This worked.  The car was disconnected from 12V and solved a problem.

Attached are some reference 12V battery pictures from my 2017 FFH.

Attached Files

Edited by stlouisgeorge, 07 October 2017 - 12:58 PM.

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#2 OFFLINE   lolder


    Fusion Hybrid Addict

  • Fusion Hybrid Member
  • 1,862 posts
  • Region:Decline
  • Location:Florida
  • Current Vehicle:2010 FFH 501A Trim
  • My Hybrid's Year:Decline

Posted 07 October 2017 - 06:15 PM

This is not rocket science and you don't have to go to the dealer to do a hard reboot by disconnecting the negative 12 vdc terminal for a few minutes.

#3 OFFLINE   ptjones


    Fusion Hybrid Enthusiast

  • Fusion Hybrid Member
  • 794 posts
  • Region:U.S. Southern Atlantic
  • Location:Atlanta area
  • Current Vehicle:2013 CMAX SEL
  • My Hybrid's Year:2013

Posted 09 October 2017 - 08:43 AM

You will lose most of your settings on your displays. You might want to take some iPhone pics of all your settings before discounting the 12v battery.



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Current Record:  12/30/2014  902.2 mi.  63.8 mpg  14.13  gal. (Actual GPS:  922 mi.  68 mpg  13.5 gal.

#4 OFFLINE   Kevin Carson

Kevin Carson

    New Member

  • Fusion Hybrid Member
  • 1 posts
  • Region:U.S. Northeast
  • Location:Upper Saddle River NJ
  • Current Vehicle:Ford Fusion Energi
  • My Hybrid's Year:2016

Posted 10 July 2018 - 02:25 PM

Why is is so hard to loosen the nut in the 12 volt battery negative terminal for my 2016 Fusion Energi, I'm afraid I may break the black plastic piece. Any suggestions ?

Also tagged with one or more of these keywords: battery, 12v

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