[AT] Ingersoll 6018

[craig.warner47346 at frontier.com]

Not particularly antique but I’m having an issue with a 1993 Ingersoll 6018 with an Onan P218 engine and I’m betting there will be someone here that knows more than I do. 
I used it all day yesterday. At one point when I turned key to start, the engine didn’t turn. There was no click, no spin...nothing. I turned key again and the starter acted normal. I used it the rest of the day, stopping and starting several times. This morning, it was back to complete silence when I turned the key. Messed around a bit and decided it was the ignition switch. Bought a new one and still nothing. Since then, I’ve:
1. Jumped from large lug to large lug on solenoid. Starter and engine turned like normal.2. Checked continuity on small wire from solenoid to safety switch. It’s fine.3. Checked continuity on safety switch. It’s fine.4. Checked continuity on wire from safety switch to ignition switch. It’s fine.
I’m thinking the solenoid is bad but where I’m a little confused is on testing the small wire that plugs into the solenoid. If the ignition switch is on, should there be voltage at that wire or is it a negative circuit that is completed by turning the ignition switch?
Any help would be appreciated. I’ve attached a screenshot of the wiring diagram for reference.

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