I have a bolens riding lawn mower, it was working fine. Then one day it just wouldn't
Crank. It does nothing, no turning over, no clicks or anything. I replaced the battery.
And still nothing, is it perhaps a safety switch?

Hi,
Yes, it probably is a safety switch. Nowadays they are on the brake and the blade engagement. Of course, double check that the blades are turned off; not as obvious if it is an electric clutch.
Peace,
Clarke