what do i check first

[Mr Chevorlet]

Well I got my cab on and wired everything up in the engine bay. My problem is it cranks over and and when I crank it will fire but when the key switch goes to the run position it will not run. So I am not getting power to the coil from the run side of the switch. So what do I check first. And is the key switch run wire directly to the coil .thanks for any help.