2003 Sportsman 90 that won’t start

Hello,
I’m hoping someone here can help me. After much reading and buying, I am stumped. I have a 2003 Sportsman 90 that won’t start. At this point, I have replaced the battery, stator, CDI, coil, and the Brake Sensor switch.
I have jumped over from the battery to starter and it will turn over (red to red/white) at the relay box, which clicks when I do. The machine will still not start. I should mention I have no tail light either.
This leads me to believe that it is either the electric start switch or one of the 2 kill switches. Is there a way to bypass these or test these to isolate or eliminate these as the problem? I do have a multimeter. Also, if these check out ok what would be my next move, short of crying ?:)
Thank you in advance,
Scott