2015 pinnacle No crank, no start

[mackrmodel686st]

Here's a weird one. Have a 2015 mack pinnacle with the mp7 engine. Turning the key to the run position does nothing, when turned to the start position everything turns on like it's in the on position but won't start. When you let off the key everything turns back off. Replaced the key switch thinking that was the problem, does the same thing. Turning the key to the accessory position does nothing. Has anyone run across this problem? Thanks in advance.