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When a power switching relay "chatters" the reason is, in every case I've known, high resistance in the power source. What occurs is, once the load is connected by the relay contacts, the high resistance results in the voltage across the coil being reduced, so the relay drops out. Once it has dropped out, the load is no longer connected, so the voltage rises and the coil acts again, and the process repeats.
In a small relay, it sounds like a buzzer. In the starter solenoid (partially a big relay) it sounds more like a toy machine gun.
Anyhow, high resistance can be most anywhere, but the first places I would look are the battery terminal and battery cable. Second would be the terminal where the battery cable attaches to the starter solenoid.
Check that battery cable. Depending on the tools you have in the field, a good tug, or wiggle might reveal the trouble. I wonder about the solenoid end of it since you had luck with the broomstick method.
In your place, if I had to pack for a trip, I'd bring a spare set of battery cables, both plus and minus, along with that spare starter. Not sure what that's like on the late prod '93 with those fuses there.
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Art Benstein near Baltimore
"Oops! There goes my hat!" said Tom off the top of his head.
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