Disconnecting your 12V Battery Temporarily

[stlouisgeorge]

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.

Edited October 7, 2017 by stlouisgeorge

[lolder]

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.

[ptjones]

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.

 

Paul

[Kevin Carson]

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 ?

[Kent Day]

Is there any issue with the radio when disconnecting the battery? Such as security code needed?

[ptjones]

You will loose your radio settings.

 

Paul