LOL, joy buzzer

Okay, what I run into guys is the eletric shift I put on my trike, the gizzmo that is supoosed to kill the motor for a split secound and shift at the same time, well,,, it shifts but don't kill the motor.
I eliminated it and put on a handle bar mount push button kill switch and wired it into the O.E.M. kill switch and it will shift great once and then leaves the selinoid engergized.
I am thinking the way I have it now that it is backfeeding power to the selinoid.
So that is why I am thinking to simple thinks up, just run a kill wire to the plug since I am making/breaking connection on the negitive side of the wiring anyway.
the hot lead from battery is fused close to the battery, then to a toggle switch.
I will tell you what, the one time you have to operate the shifter convinced me this is the way i want to go for straight line drags.
C/mon Vealmonkey what do ya say, possble to take out the c.d.i. ???