Re: 7.3L starter solonoid
After the 2 starting failures I wrote about, it never acted up again. I'll let sleeping dogs lie for now.
When mine failed, the starter spun up - it just didn't engage the fly wheel. I think that it's a failure of the solenoid on the starter that throws the Bendix gear.
The one on the fender wall delivers power to the whole starter assembly and when it fails you just get a click.
I don't know if the solenoid on the starter is an easy replacement or if you need to swap out the whole starter.
2002 E350 7.3 PSD
Quigley 4x4, EB50 floorplan