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I have recently purchased a 2016 Focus S, automatic, which according to FMCA and the Manual, is towable, four wheels on the ground.

Can anyone explain why I must disconnect the negative battery cable prior to towing?

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BarbHasenfus, Welcome to the FMCA Forums!

Usually that is recommended for cars that will turn on modules once it senses the vehicle in motion. Most Ford products go into a “sleep” mode after 15 minutes as long as it’s sitting still where all of the computers shut down and only draw power to keep memory. 

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If anyone wants to install a good negative battery disconnect instead of pulling the battery cable, a switch like this one can be used. https://www.wirthco.com/battery-doctor/battery-disconnect-switches/commerical-heavy-duty-disconnect/emergency-push-button-switch I know this is not answer to OP's question, Joe has already answered that, only added this for information as a better idea. By the way, BarbHasenfus, welcome to the forum.

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