What I recommend is when doing this job and reinstalling the housings, put them together in the position that they will be when finished without any of the screws installed and hold the housings like this and install the screws without tightening them all the way. Best done with an extra set of hands. After they are in position and completely joined,Check the operation of the brake light by operating the front brake handle then you tighten the screws. It eliminates the possibility of pinching wires or missing the brake light switch doing it this way because you can feel if the switch housing halves are not completely together.
Here's a preview of how to do the job.
Chrome Switch Housing/Grip Install Link 1
Chrome Switch Housing/Grip Install Link 2
Here's a preview of how to do the job.
Chrome Switch Housing/Grip Install Link 1
Chrome Switch Housing/Grip Install Link 2