You need to do more than check for 12 volts. You have to check for voltage drop when you turn the key. If you hear a single click you have a bad connection somewhere on the battery terminals or at the starter. Most often a single click will indicate a bad starter solenoid.
http://www.truckmountforums.com/foru...tage-drop.html

I'll check for voltage drop but I don't even get a single click and my fuel pump does not come on.

If you dont hear your fuel pump then you may have a disconnection at the ignition or one of the accessory wires on your engine is disconnected. My guess is that you pulled a wire out when you pulled your panel back. My Kohler has accessory wires on both sides of the motor and some Kohlers have them on one side only.

It's a Kohler.

I'm gonna play with it this afternoon. What does the fuse look like? Is it visible or is it under some of the covers?