" The reason I pulled you over - Is you don't have a brake light . . . Now I realize you are 47 years old, and have insurance, but . . .

Now that I look at this - the brake light and horn would only work when the lights were on . . . ?   
I'd wire it so when you turn on the(IG) ignition switch - it also feeds the brake light switch and horn button. ( I personally only utilized this to assist me with installing a Bosch Relay )