Cat 311B wont start

I have a 2000 Cat 311b excavator.
When I turn the key on, the dash lights come on and the normal beep sounds.
When I turn it one more notch to crank it, nothing happens. It is as if I have not disengaged the safety lever/arm that when in operating position will not permit cranking.
This safety switch does seem to be making contact correctly (but I have not omh'ed it out)
I've checked all fuses, including the big ones near batter box (60 amp). There appear to be no problems with them

Anyone ran into this problem or have any tips?

Thanks in advance,
Respectfully
Stacy Whetzell

Cat 311B wont start