Brake system power with Battery disconnected

bayoubelle wrote:
I have a 2016 Ford Focus 2.0 L Hatchback, the dealer installed the StaY n Play Duo braking system. Unfortunately he did not install a battery disconnect, he insisted the brake would not work if he did.

We know that we have to disconnect the black cable. So we called SMI (Brake co) and they said to disconnect the positive terminal, with a turn off switch. That the brake system needs the ground from the black.


Any advice?

I went back and re-read your original post after I had already offered a comment and think I misunderstood your question. I had assumed you were concerned about the SMI unit staying active when not towing which I think was not your concern. You are were concerned about the toad onboard systems being powered up during towing since you must have to have the key in an "on" position to unlock the wheel? You've got the problem covered it sounds like. I apologize for my adding to the confusion.

I did not have the same issue with my Jeep as Chrysler allowed an unlock position on the TJ with the key but I really did not like leaving the key in the ignition when towing and was concerned that I might forget to unlock the wheel sometime anyway so I disabled the steering wheel lock on the Jeep like many do so I would not forget.