I seem to have intermittent on my 1988 B22000 (235K miles); failure to crank the engine using the key. I hope to be able to do some troubleshooting this afternoon, but may have to wait until next week when the engine is "cold".

I am ruling out the clutch contact switch as I can hold this down continually until turning the key several times gets the starter to spin. Battery is less than 2 months old, as I got a free replacement while I still had a couple of months left on the Walmart 3-year free replacement warranty. My starter is the factory one still, my ignition switch electricals were replaced about 1995.

So I need to measure voltage at the starter small terminal, to see if the electrical part of the ignition switch is making continuity to the starter. If that's bad, I might try to clean the switch as others have done. Or maybe I'll wire-in a separate momentary toggle switch as a "Start" switch - but does anyone know how many amps such switch would need to be???

Update: this afternoon I couldn't get it to "not crank". So I just cleaned the terminal and terminal connector at the starter for now.