I have a 1983 35 H.P. Johnson. This was a tiller motor converted to a remote. On my remote box, there is no kill switch, and I do not see any location where I can put one in on the control box. My question is this: Can I locate a kill switch on the outside of the box and do the electrical hook up on the wiring leaving the control box in some manner? If so, what color wire am I looking for to ground out with the kill switch to kill the motor if/when needed? Thanks.