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Old 03-21-2018, 09:47 AM   #1
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Question 2016 Ford Focus Toad Questions

I am just about finished setting up my 2016 Ford Focus Hatchback to tow four on the ground. My questions are: 1) does anyone out there successfully tow a Focus WITHOUT disconnecting the negative battery cable? 2) does anyone disconnect the positive cable? 3) does anyone leave the battery connected and run a charge circuit from the motor home? I am going to use a Roadmaster Brake Master Breaking system and I don't believe I can make the indicator light on the motor home dash work with the toad's battery disconnected. Any info related to these issues would be greatly appreciated. Thanks!
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Old 03-21-2018, 09:54 AM   #2
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There is no reason to disconnect the + cable instead of the - cable and a bunch of safety reasons not to.
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Old 03-21-2018, 10:37 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Does the owner's manual say to disconnect the battery cable? I've never heard of that!

Good luck, happy trails, and God bless!
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Old 03-21-2018, 10:52 AM   #4
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I have a Chevy Colorado that required a battery disconnect when towing four down.
I bought a device similar to this:
https://www.amazon.com/BatteryProgBr...=battery+brain

It disconnects my battery on the positive with a remote. Been towing over two years with it now and works great. It even save my battery one time when I forgot to turn of an amatuer radio wired directly to my battery. I did have to install a 12v source directly to the battery to power the Patriot brake system.
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Old 03-21-2018, 10:56 AM   #5
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Just ran a charge line to my Edge. No problems. Never disconnect the battery.
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Old 03-21-2018, 04:30 PM   #6
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The ford focus manual says to disconnect the battery. My major question is this only to prevent battery discharge or is there some other "deeper" reason for the battery disconnect?
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Old 03-21-2018, 04:34 PM   #7
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Does your Edge manual say to disconnect the battery? I am trying to determine if the only reason Ford says to disconnect the battery is to prevent battery discharge or if there is more to the disconnect than just preventing the battery from going dead.
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Old 03-21-2018, 06:39 PM   #8
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I have a 2015 Focus and I installed a disconnect on the negative cable. The only reason that I found for the negative disconnect was IF there was a stray short on the positive side that it MAY cause the transmission to kick into gear as the computer MAY sense the wheel speed and try to engage the transmission. But that statement wasn't Ford gospel, just someones interpretation of why and sounded logical to me. The other reason was if there ever was a problem Ford couldn't say improper operation.

I am using the Ready Brute tow bar and the Ready Brake which doesn't require any electricity. Happy with the setup.
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Old 03-22-2018, 06:23 AM   #9
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I have a 2016 Focus. The manual says to disconnect the neg. Not sure of the reason, might be that the transmission is controlled by a computer. It is a pain in the butt to get to the battery, but I installed a battery disconnect and now I just turn the switch. Takes less then 5 seconds and won't void my warranty.
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Old 03-22-2018, 06:27 AM   #10
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you won't be able to remove the key from the ignition without a battery disconnect, and therefore probably won't be able to lock the doors either. Other than that, it's probably just to keep normal 12v items from discharging the battery on long trips.
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Old 03-22-2018, 12:52 PM   #11
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No, my Edge manual does not say to disconnect the battery. It does require the key be left in the accessory position and start the engine every six hours. The charge line was cheap insurance.
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Old 03-22-2018, 12:54 PM   #12
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remember, each of these FORD vehicles are not the same, and their requirements for towing may be different, for various reasons - just 'focus' on the FOCUS, as that is what you originally asked about.
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Old 03-22-2018, 08:32 PM   #13
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I tow a 2013 focus. The purpose of disconnecting the battery is to ensure the transmission stays in neutral during towing. I just disconnect the positive side using a disconnect switch installed under the hood.

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Old 03-23-2018, 04:55 AM   #14
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I don't know about the 2013 Focus, but I do know the 2016 Focus it says to disconnect the neg terminal. I even called Ford to verify this. My key does stay in the ignition, but I do lock the doors before I disconnect, so after I disconnect I just have to lock the driver door with a spare key.
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