If you install a battery switch (like the red knob type showing in above pictures), do install it properly. Properly is on the "+" cable and installed between the battery and its chassis - "above its emergency brake cable". By using this placement method, the battery switch can be on or off and its emergency brake away switch will always have power (when needed). If you install on "+" or "-" cable below the emergency brake cable (like many folks do), then one's TT won't have emergency brakes when this switch is accidently left in the OFF position. And beside this, one is also introducing more connect (possible) fail points within its emergency brakes wiring. If going to install a battery switch, then do it properly (as show in below picture).
