Denali cansmart Brake light to topbox.

[Trilergy]

Hi
I've installed the Denali CanSmart lights and horn to 17 R1200rt. All works great.
Now I want to use the brake light feature on the top box.
Top Box is powered.
Has anyone installed the brake light from Cansmart directly to the top box brake light?
If so how do I do it...Ive seen lots of posts about cutting into existing circuit etc but none definitive enough to follow conclusively.
I don't need it to use the standard brake light circuit...happy to have CanSmart only for the topbox instead of their number plate light suggestion.
Thanks

[Rwslater]

I put the brake light on my license plate using the part from Twisted Throttle. Works well

[hammo]

you tube my friend a chap shows you step by step !!!!!