Model number needed but I suspect you may have a lap bar safety switch(es) burned out. Really depends if they are running the control voltage though the switches (most CC ZTR do for the starter replay(solenoid)) or not. I have replaced several switches on the CC lap bars that cause this. Getting to these switches is a pain too as the last one I had to remove the seat and seat pan to get to the switches. It was difficult because the rivet nuts had came loose requiring me to cut the screws off. Then of course those rivet nuts had to be replaced too along new screws so the set could be put back on.
If one lap bar switch is burned out, replace both. Being a pain to get to is the reason to do both while you are in there if one is bad.